ST GEORGE’S SCHOOL SEVILLE
GEOGRAPHY IGCSE REVISION GUIDE CASE STUDIES
What do you need to know?
You should use this CASE STUDY guide to learn all your case studies AND the IGCSE Cambridge
revision guide for theories and key terms
This is mainly for your 7 mark case study questions and there are exam questions included for you to
practise.
LEARN THEM!
Theme 1. Population and Settlement
1.1 Population dynamics
1.2 Settlement
Theme 2. The natural environment
2.1 Plate tectonics
2.2.1 Weathering
2.2.2 River processes
2.2.3 Marine processes
2.3.1 Weather/ 2.3.2 Climate/ Ecosystems
2.3.3 Natural hazards
2.3.4 Human impacts: National Parks
MOCK EXAMS ON ALL ABOVE! JAN 2015
Theme 3. Economic development and the use of resources
3.1 Agricultural systems
3.2 Industrial systems
3.3 Leisure activities and tourism
3.4 Energy and water resources
3.5 Environmental risks and benefits: resource conservation and management
Case studies by unit
Unit:
1.1
Population
1.2
Settlement
Topic and case study:
Rapid population growth: Case Study Niger
Overpopulation/anti natalist policy: Case Study: China
Under population: Pro natalist policy: Case Study Singapore / Italy
Population density and distribution: Case study: Botswana
International Migration: Mexico to USA
Rural to urban migration (internal migration) Case study: Brazil
HIV/AIDS: Case study: Botswana
Case study: Rural settlements and Ethiopia and France
Case study: The reasons for the growth of an urban settlement: Seville
Case study: Urban model Seville
Case study: The effects of urbanisation / urban sprawl LEDC Case study: Rio de Janiero
Case study: The effects of urbanisation / urban sprawl MEDC Case study: Atlanta
2.1
2.2.2
2.2.3
2.3.1/2
2.3.3
2.3.4
Case study: Urban problems: Cairo, Egypt LEDC
Case study: Volcanic eruption MEDC Mount St Helens
Case study: Volcanic eruption LEDC: Mt. Pinatubo volcano in the Philippines 1991
Case study: Earthquake LEDC Haiti
Case study: Earth quake MEDC Kobe, Japan earthquake 1995
Case study: formation of a waterfall Niagara Falls
Case study: Living by Deltas Ganges, LEDC, Bangladesh
Case study: Flooding of the Brahmaputra and Ganges Rivers, Bangladesh (LEDC)
Case study: Flooding MEDC Boscastle UK
Case study: River management in MEDC: Mississippi River, USA
Case Study: Coastal erosion, transportation & deposition: The Hel Spit Poland
Case study: Coastal Landforms: The twelve apostles
Case study Coral Reefs: The Great Barrier Reef
Case study: Tropical Rainforest climate: Madagascar
Case study: Tropical Desert Climate: Sahel, Africa
Case study: Drought: Australia MEDC
Case Study: Drought Ethiopia LEDC
Case study: MEDC Tropical Storm: Hurricane Floyd, USA 1999 (MEDC)
Case study: LEDC Tropical Storm: Cyclone Myanmar
Case study: Deforestation of Tropical Rainforest: Amazon Rainforest
Case study: Sustainable Rainforest Scheme: Costa Rica
Unit 1.1 Population Dynamics
Population growth
The world’s population is increasing rapidly
Natural population change (NPC) is worker out by:
BIRTH RATE (BR) – DEATH RATE (DR) = NPC
If the answer is positive the growth rate is getting bigger and if the number is negative the growth
rate is getting smaller.
The unit is usually per 1000 people and to make it a percentage you must divide by 10.
Demographic transition model
The model shows that as a country develops the BR and DR change.
It is based on what happened in Europe and America in the past and is now used to predict the
population changes that will occur to developing nations (LEDCs)
Rapid population growth: Case Study Niger
Where is Niger?
West Africa, next to Algeria, Libya, Chad and Nigeria.
Information on Niger:
One of the poorest countries in the world
Mostly nomadic farming
Fertility rate of 7.1 babies born per woman
½ population is under 15 years old
It has a youthful population
Why are the birth rates so high?
Children needed to support farming
No sex education in countryside
Children wanted to look after parents when they are old
No social security
5% of people have access to contraception
Problems with population growth:
Limited access to clean water and resources
Population is rising as death rates fall and birth rates stay
the same or increase.
Why are death rates falling?
Vaccinations for children against diseases
Better supplies of water
Better diet
Better health care
Women becoming educated
No enough schools or jobs
Solutions:
Increase family planning clinics and education
Educate women
Higher age of marriage set to 18
Over or under population
Over or under population
Overpopulation: The number of people living in a place is more than the amount of resources
available – not enough resources to go around
Under population: The number of people living in a place is less than the number of resources
available – an excess of resources and a loss of money for the country, limited workforce
Overpopulation/anti natalist policy: Case Study: China
Where? Asia
What? People encouraged to have lots of children in the
1950s/60s to ensure Chinese victory in event of a war.
Problem: No enough food, jobs, healthcare, housing or
services for all the people and population was still rising
in 1970. The crime rate was rising and the country, air
and water were becoming polluted. A very low quality of
life.
Solution: One Child policy: Couples in cities only allowed
to have one child and must apply for permission from the
government. Free contraceptives and education on
family planning for all and an excessive propaganda
campaign. Couples in rural areas may have two children
if the first is girl or first child disabled or died.
Consequences:
Good:
China’s population of about 1.3 billion is said to be 300
million (.3 billion) smaller than it would likely have been
without the enactment of this policy.
The fertility rate has fallen to 1.7 births per woman.
Such a reduction in fertility reduced the severity of
problems that come with overpopulation, like epidemics,
slums, overwhelmed social services (health, education, law
enforcement, and more), and strain on the land from
farming and waste
Bad:
Uneven proportion of boys to girls as many girls are
aborted, heavy fines put on couples who wish to have a
second child so richer people can afford it while the poor
cannot. Spoiled children.
Some babies killed or sold if they are girls. Some women
forced to have abortions or be sterilised.
BUT: Population growth has been stabilised, policy has
been relaxed since 2003.
Under population: Pro natalist policy: Case Study Singapore / Italy
Where? Asia
What? Independent from the British since 1965, from
1950s tried to limit population by encouraging smaller
families but now has a declining population and a limited
Pro natalist 1980s: increased immigration, female
university graduates having children were given the best
school places, grants given to new parents, tax rebates
for third child, day care for children subsidised, 4 years
workforce
Anti natalist 1970s: Abortion and sterilisation made
legal, ‘stop at two’ campaign, extra tax on third child,
best schools’ places given to those with fewer children.
maternity leave for civil servants.
Outcomes: Not much change in the BR but immigration
has continued to help the economy
Where? Europe
Low fertility rates of 1.23 children per family
Ageing population
Some women feel that they cannot work and cope with
raising a family too
Some men not doing sufficient household chores
Poor service provision for childcare in preschool years
Childless no longer bears a stigma
Social pressure to marry and have children is less
Even though head of the catholic church is in Italy –
contraception use is high
Yuppiedom – preference for luxury goods delays
marriage and babies
Less than 1/3 mothers have children before 28 years
Young people live at home with parents longer to save
rent etc. which delays relationships and births
Solutions
10,000 euro bonus for births in a village in Mezzogiornio as
mayor concerned that young people will not enter village
otherwise
Population density and distribution:
Why are some places densely populated?
Employment, flat land, good communications, fertile soil, reliable water supply and natural
resources.
Why are some places sparsely populated?
Steep relief, infertile soil, cold climate, arid climate and marshy land.
Population density is the average number of people living in a given area (measured in people per
km2)
Total number of land\total population = number of people per km2
But: Only if people are evenly spread out, which they are not!
Case study: Botswana, Kalahari desert Population density and distribution
Physical factors:
Kalahari area is semi desert with annual rainfall of less
than 400 mm
Soil is sandy and not fertile and other areas are protected
as national parks
Human factors:
Many people are nomadic farmers and have no fixed
settlements.
Other areas:
Deltas are wet and swampy
Economic factors:
Farming is very difficult in the Kalahari desert
Land cannot support animals or crops
Few roads and transport links
Chobe district has many dangerous wild animals
There are large areas of salt plains with no drinking water
Migration and its effects on population
Types of migrants:
Asylum seeker: person who has left due to fear of persecution
Refugee: person has left due to fear for their life from war, famine etc. FORCED MIGRATION
International migrant: person who moves to another country (if for work: an economic migrant)
National migrant: person who moves to lives somewhere else in their own/the same country
VOLUTARY MIGRATION
Illegal migrant: person who enters the country without permission
International Migration: Mexico to USA
What is the situation?
Mexicans make up 29.5 % of all foreigners in the USA.
Mexican immigrants account for about 20% of the legal
immigrants living in the USA.
Brain drain is occurring out of Mexico.
e.g. An estimated 14,000 of the 19,000 Mexicans with
doctorates live in the USA (International Organization for
Migration)
PUSH factors:
Push factors from Mexico (Santa Ines) (2010)
Poor medical facilities – 1800 per doctor
Low paid jobs – GDP per capita $14,406
Adult literacy rates 55% - poor education prospects
Life expectancy 72 yrs.
40% Unemployed
Unhappy life – poor standard of living
Shortage of food
Poor farming conditions
National average poverty level of 37 percent
PULL factors:
Excellent medical facilities – 400 per doctor
Well paid jobs – GDP per capita $46,860
Adult literacy rates 99% - good education prospects
Life expectancy 76 yrs.
Many jobs available for low paid workers such as
Mexicans
Better housing
Effects on USA
Illegal migration costs the USA millions of dollars for border
patrols and prisons
Mexicans are seen as a drain on the USA economy
Migrant workers keep wages low which affects Americans
They cause problems in cities due cultural and racial issues
Mexican migrants benefit the US economy by working for
low wages
Mexican culture has enriched the US border states with
food, language and music
The incidents of TB has been increasing greatly due to the
increased migration
Effects on Mexico (Santa Ines)
The Mexican countryside has a shortage of economically
active people
Many men emigrate leaving a majority of women
Women may have trouble finding marriage partners
Young people tend to migrate leaving the old and the very
young
Legal and illegal immigrants together send some $6 billion
a year back to Mexico
Certain villages such as Santa Ines have lost 2/3 of its
inhabitants
Family links
Bright lights
Rural to urban migration (internal migration) / Urbanisation Case study: Brazil, Sao Paulo
What and where: South America
Population urbanising in Brazil
Moving from north east rural areas e.g.
Pernambuco village
Moving to Sao Paulo
SP – On the south east coast of Brazil, West of
Rio de Janeiro
SP – Has expensive apartments and houses –
large gardens, swimming pools, maids, children
well educated, security guards etc.
BUT also favelas!
Push factors:
Mechanisation of farms (bringing in
machinery to replace workers) results in high
rural unemployment
Large landowners take back the land of
their tenant farmers to grow cash crops (crops
for money!) for export
High infant mortality due to lack of clean
water, electricity, sewerage and medical care
Housing in rural areas is even worse than
in the city
Droughts and desertification (like the
Sahel!) in NE Brazil
Lack of services e.g. schools, shops, etc.
NE Push Factors – milking by hand, drought +
desertification and Pernambuco village
Pull factors:
Advertising campaigns were run in rural
areas in the 1950s and 1960s to attract workers
to the city
More schools, doctors and other services
in the city
Successful migrants encourage people to
join them
Café, better SOL / IT class better education /
Skyline “Bright Lights”
HIV/AIDS: Case study: Botswana
Problems: effects on rural areas
o
Mainly young men who migrate
o
Brian Drain – intelligent tend to move,
less intelligent stay
o
Women, children and elderly left behind
o
27% of poor rural households headed by
women
o
Lowers birth-rates as lack of men
o
Elderly struggle to support themselves
o
Lack of workforce for farming – child
labour is common
o
Migrants send money back home to
families – called remittances (a positive!)
Problems: effects on Sao Paulo
•
2,000 migrants arrive per week!
•
Do not have money for apartment – end
up in illegal favelas
•
Favelas on outskirts of SP, on disused
land e.g. opposite factories or on steep hillsides
prone to landslides
•
Made from wood, corrugated iron,
cardboard etc.
•
Most have no clean running water
(cholera), toilets, safe electricity, rubbish
collection
•
Overcrowded, disease spreads
•
High birth-rate, 6 kids per shack!
Management of problem – Self-Help Scheme
Run by local government and NGOs
(Non-government organizations)
Local gov provides – breeze blocks,
roofing tiles, electricity, clean water, tarred
roads, community centre
Self-help so favela dwellers – dig ditches
for pipes + build houses
Gives sense of pride + community spirit
Saves money so cheap houses
HIV: initial virus caught by the exchanging of bodily fluids, breast milk or blood – can be treated but
not cured.
AIDS: later stages of HIV virus which attacks the immune system and allows other infections into the
body.
Where: Africa (see above)
Problem:
In 2005 an estimated 270,000 people living with HIV (total
population below two million)
24.1% of people have HIV/Aids
Life expectancy less than 40 years in 2000-2005, a figure
about 28 years lower than it would have been without
AIDS.
An estimated 120,000 children have lost at least one
parent to the epidemic.
First case 1985
Many people have more than one sexual partner
Ignorance about AIDS and how it is spread
Sick people cannot contribute to the economy or to their
families
Large number of orphans with not enough government
money to help them - no education or possibilities for the
future
Solutions:
(1987-89) the screening of blood to eliminate the risk of
HIV transmission through blood transfusion.
(1989-97) information, education and communication
programmes – Botswana National Policy on AIDS.
(1997 onwards) education, prevention and comprehensive
care including the provision of antiretroviral treatment for
19,000 people.
HIV prevention programme:
Public education & awareness –
1. “ABC” of AIDS: Abstain, Be faithful and, if
you have sex, Condomize.
2. Safe-sex billboards and posters
everywhere.
3. Radio drama dealing with culturally specific
HIV/AIDS-related issues and encouraging
changes in sexual behaviour.
4. Workplace peer counselling.
Unit 1.2 Settlements
Rural Settlements:
Settlement: A place where people choose to live
MEDC: More economically developed country (richer countries like USA and European countries)
LEDC: Less economically developed country (poorer countries like Botswana, African countries)
Nomads: People who move from place to place and have no fixed settlement where they live
Urban settlements: Towns and cities (85% of people from MEDCs live in urban settlements)
Rural settlements: the countryside (75% of people in LEDCs live in rural settlements)
Site: The places people choose to build their settlements
Situation: The location of settlement
Shape: The shape the settlement has (nuclear, dispersed, linear)
Function: The main activities of the settlement
Nucleated settlement: buildings all clustered together around a central point
Dispersed settlement: buildings spread out in no particular pattern like farms or isolated dwellings
Where do/did people choose to site their settlements?
In places which have: water supply, gentle slopes, low altitude, good drainage, no flood risk,
resources (such as forests for building)
Case study: Rural settlements and Ethiopia and France
Ethiopia LEDC
Function: Farming maize
Advantages: water from 2 rivers, flat fertile soil, forests.
Services built like schools, mosques, a grain mill.
Disadvantages: lack of rain, drought, hunger, starvation,
heavy rain comes and then washes away dry soil, no market
or shops
Deforestation: due to the forest being cut down the soil is
more easily eroded
Solutions: irrigation system and diesel pumps sponsored by
American NGO
France MEDC – changes in rural settlement
Function: farming and tourism
Changes: larger fields, different crops, caravan parks,
increased tourism, land sold, young moving to the cities,
aging population, decline in services, more English owned
businesses.
Urban settlements:
Settlement hierarchy: settlements put in order of size and services they provide
Sphere of influence: The areas which a settlement serves (how far people are willing to travel to use
the services in that settlement)
Low order services: mostly in rural settlements, used frequently and selling basic and cheap
products; e.g. bread and milk – need low threshold population
High order services: mostly in or near to urban settlements, used less frequently with products that
are not needed on a day to day basis; e.g. televisions – need high threshold population
Threshold populations: The number of customers needed for a business to survive.
Functions of urban settlements
Market town: where farmers buy and sell goods
Port: where goods are loaded and unloaded by ship
Industrial town: where factories are located close to resources or transport on rivers
Resort: where tourists come to enjoy themselves
Case study: The reasons for the growth of an urban settlement: Seville
Where: Spain
Function of settlement: tourism, industry, market town
Original site features: flat fertile land to grow oranges
and food, water supply, Mediterranean climate.
Reasons for growth: close to sea, port leading to gold
coming from South America, factories grew along the river,
culture and history brought tourism, famous for oranges
Urban land use
Models: Burgess and Hoyt created models to show how land is usually used in an MEDC based on
the value of land. Burgess’ model comes from when cities and towns began to industrialise along
rivers for transport and therefore poorer people were forced to live nearer the factories in the
centre of the city. Hoyt then modernised the model as factories declined or moved further outside
the city as transport improved.
CBD: The central business district. You would expect to see: expensive land, high density of
buildings, crowded, high order shops, industry (in MEDCs), offices, and flats.
Case study: Urban model Seville
CBD
High order shops e.g. El Corte Ingles, pedestriansed,
transport links, metro, underground rail service, offices,
small medieval streets
Inner city
Residential areas with flats, rejuvenation of old factory
buildings, high density of living spaces, no gardens,
transport links and services, offices
Urbanisation
Outer city
Larger houses with gardens, transport links developed, low
and high order services, shopping malls as land is cheaper.
E.g. Ikea, Aire Sur
The movement from the countryside to the city
MEDCs: Took place mainly before the 1950s during the industrial era
LEDCs: Is now beginning to happen in LEDCs because of a) lack of resources in countryside PUSH b)
standard of living in urban areas are better PULL
Rural to urban migration
Push: poverty, not enough land, failed crops, high infant mortality, no prospects, loss of farm work,
lack of food, drought.
Pull: education, medical care, housing, jobs, shops, money
Problems: noise, dirt, pollution, over crowded, expensive land, low paid jobs
Urban sprawl: Urban settlements extending into the rural urban fringe. Planned in MEDCs, not
planned in LEDCs
Case study: Urbanisation in LEDC
USE CASE STUDY FOR RURAL URBAN MIGRATION BRAZIL, SAO PAULO FROM UNIT 1.1
OR:
Case study: The effects of urbanisation / urban sprawl LEDC Case study: Rio de Janiero
Where and what is it?
Rio was formerly the capital of Brazil until the government
decided to locate the capital inland in Brasilia.
Approximately 10 million people live in and around Rio.
It is a city of contrasts with rich people living in luxury
around Copacabana beach and the vast majority living in
poor conditions around the edge of the city.
Problems in the city include housing, crime, traffic and
pollution.
HOUSING
An estimated 0.5 million are homeless.
Approximately 1 million live in favelas (informal shanty
settlements). Two examples are Morro de Alemao and
Rocinha. (YOU MUST KNOW THESE NAMES!!)
Another million live in poor quality government housing on
the outskirts.
The favela housing lacks basic services like running water,
sewerage or electricity.
The houses are constructed from wood, corrugated iron,
broken bricks and tiles or other materials found lying
around.
Favelas are often found on land that is steep, by the side of
roads, railways etc. and flash floods can destroy such
houses and take people’s lives.
At first the government tried to bulldoze such
communities but now they remain because of the
community spirit, samba music and football etc.
CRIME
Favelas are thought to be associated with drugs, violence
etc. Tourists to Rio are warned not to enter favela areas or
take valuables to beaches etc.
Some wealthy are moving to new towns to avoid crime.
TRAFFIC AND POLLUTION
Mountains around the city keep the fumes in the city and
make the vehicles use a limited number of routes. This
results in congestion and noise
A vast amount of rubbish is produced and in favelas this is
not collected. Along with open sewerage drains it results
SOLUTIONS TO THESE PROBLEMS
SELF HELP HOUSING ROCINHA
Most of old temporary wooden houses replaced by brick and
tile and extended to use every square centimeter of land.
Many residents have set up their own shops and small
industries in the informal sector.
Government has added electricity, paving, lighting, water
pipes but the steep hills still restrict.
2.
FAVELA BAIRRO PROJECT
1990S government chose 16 favelas to improve using 250
million euros.
Replaced wood buildings with brick and gave each house a
yard.
Widened the streets so that the emergency services and
waste collectors could get access.
Improved sanitation, health facilities and sports facilities.
Used residents for labour to develop their skills and in return
residents paid taxes.
3.
NEW TOWN BARRA DA TIJUCA
Land outside to South of Rio was uninhabited until
motorway was built in 1970s
Rich moved out of Rio to avoid problems of city
It has 5km of shops, schools, hospitals, offices, places of
entertainment etc.
Spacious and luxury accommodation in 10-30 floor high rise
apartment blocks with security and facilities or detached
houses.
Both adults in each family chose to work in high paid jobs to
pay for expensive life.
Families with own cars but also well connected with public
transport.
BUT: These areas have own favelas as house keepers,
gardeners etc. cannot afford accommodation
in the spread of diseases.
Case study: The effects of urbanisation / urban sprawl and solutions MEDC Case study: Atlanta
Where:
Capital of Georgia, USA
What:
Between 2000 and 2006 there are 1 million more people
moved there because of increased birth rate and
migration.
Problems:
urban sprawl, traffic congestion, polluted drinking water
from overflowing used septic tanks (where your poo
goes), farm land bought up, loss of green space and
ecosystems, flooding, loss of cultural sites, social divides
between poorer inner city and richer outer city,
temperatures rising due to removal of trees.
Solutions:
New public transport system for the inner city, investment
into ‘green buildings’ in the centre and on old factory sites;
e.g. 5000 flats being built on old steel mill site. Planting more
trees around Atlanta and persuading people to move back
into the centre with sustainable new buildings.
Urban problems and solution
Problems:
Cities cannot cope with the growing numbers
Limited housing, services, transport and jobs
Stressful living conditions and protests from residents
Urban decay: parts of city become run down and slum housing appears (think Tres Mil Viviendas),
vandalism, derelict housing.
Solutions:
Urban regeneration: rebuilding, renovating old factory sites or derelict houses, knocking down old
factory buildings and creating flats, medical centres and offices.
Introducing news transport systems such as elevated railways, undergrounds, metros
Pedestrianised areas for shoppers and workers in the CBD
Urban problems and solutions LEDC: Case study Cairo, Egypt
Where: Egypt, North Africa
Solutions:
Problems:
Satellite towns built outside the city with transport links
Rise of population from 2 million to 8 million
Homes and public services upgraded
Increased demand for piped water, sewers, schools,
Metro system built
paved roads, electricity.
Greater Cairo Water project to repair sewage system
Traffic congestion brings noise, air and water pollution.
Ring road built around the city
Lack of housing and lack of jobs
Exam style questions
Unit 1.1 and 1.2 IGCSE exam 5 mark describing/explaining and 7mark case study questions:
e.g Population
Explain the advantages of educating girls and women in LEDCs. (5)
Describe the likely problems for an MEDC, such as New Zealand, of having so many old dependents.
(5)
For a named country which you have studied, describe the problems caused by overpopulation. (7)
Name an example of a country which has attracted large numbers of international migrants. Explain
the pull factors which have attracted people to your chosen country. (7)
Choose any example of international migration which you have studied and name the countries
between which people moved. Explain why many people made the decision to migrate. You should
refer both to pull and to push factors. (7)
1.2 Settlement
Describe the typical land uses and characteristics of the CBD of a city. (5)
Suggest how urban growth may have created problems for people in Maseru, the capital city of
Lesotho. (LEDC) (4)
Describe the effects of rapid urban growth on the natural environment. (5)
Describe the problems for people using the CBD of a large urban area. (5)
Name a city in an LEDC and describe what has been done to improve the quality of life of the people
who live there. (7)
Choose one problem of living in urban areas. For a named urban area, describe the attempts which
have been made to solve the problem you have chosen. (7)
Many settlements have grown over the years into large urban areas. For a named example of a large
settlement, explain the reasons for its growth. (7)
Unit 2.1 Plate tectonics
The world’s surface if made up of tectonic plates
These plates move around due to convection currents in the magma and when they do they causes
earthquakes and volcanic eruptions depending on the type of plate boundary the movement occurs
on.
Oceanic plate: tectonic plate under the ocean (denser)
Continental plate: tectonic plate under land (less dense)
Converging boundary: (destructive)
Oceanic plate sub ducts under a continental plate = earthquakes, fold mountains and volcanic
eruption
OR 2 oceanic plates or 2 continental plates collide = earthquakes and fold mountains
Diverging boundary: (constructive)
Plate move apart from each other = magma escapes gently from the earth forming shield volcanoes
Fold Mountains: e.g. mount Everest
Folding sedimentary rocks left beneath the seas or lakes
Sea or lake beds are squeezed together and pushed upwards over millions of years
Everest is still rising!
Structure and types of volcanoes
Case study: Volcanic eruption LEDC: Mt. Pinatubo volcano in the Philippines 1991 – This was your
own choice but if yours is not very good use this one.
Where? South East Asia to the East of China
What?
600 years dormant
Island arc of Luzon in Philippines
Philippines oceanic crust subducting under continental
Eurasian plate – i.e. destructive plate margin
Erupted June 1991
Effects: Short term
847 dead
300 killed by collapsing roofs
100 killed by lahars
Aetas tribe refused to leave or died in evacuation centres
from disease
1.2 million lost homes
Long term:
Measles, respiratory and gastric diseases
Responses:
2 April steam explosions – vegetation killed and dust on
villages
PHIVOLCS set up to monitor eruption– 5000 pop evacuated
in 10km zone
23 April continuing earthquakes- US Geological Survey set 7
seismographs at Clark Air Base
NW slope villages evacuated
9 June 8 hr eruption with pyroclastic flows – Alert 5 evacuated to 20km
10 June Clark Air Base evacuated
12 June Mushroom cloud 20km high – evacuated 30km –
58,000 people
15 June – eruption 40km high ash and 80km/hr pyroclastic
flows – summit collapses. Heavy rain causes mudflows.
Affects houses, bridges and river. Manila airport closed.
500,000 migrated to Manila
650,000 lost jobs
80,000 ha of cropland destroyed
1 million farm animals died
Case study: Volcanic eruption MEDC Mount St Helens
Where:
Mt St Helens is located on a destructive plate boundary
where a continental plate (North American) meets an
oceanic plate (Juan de Fuca).
What:
18th May 1980 at 8.32am (5.1 on Richter Scale)
Effects:
All living things wiped out 27km north of the crater, up
rooted trees, 57 people dead.
Responses:
Immediate Responses – Mobilising helicopters, rescuing
survivors, emergency treatment and clearing ash to allow
the flow of traffic
Long Term Responses – Buildings and bridges rebuilding,
drainage had to be improved, replanting the forest and
rebuilding roads. $1.4 million was spent to transform the
area.
Case study: Earthquake LEDC Haiti
Where: Caribbean near Cuba.
Never major earthquakes before, buildings not built for
earthquakes. Capital, Port-au-Prince is overcrowded and
poor with people living in crowded conditions.
What:
21st January 2010
Earthquake of 7.0 magnitude
Movement along destructive plate boundary between
Caribbean and North Atlantic plates
Effects:
20,000 killed
300,000 injured
Buildings, including house, hospitals, and government
Responses:
Aid supplies from other countries slow to arrive due to bad
transport links and airports
USA engineers cleared the roads
USA sent 10,000 soldiers
Temporary tents for housing and 20,000 relocated
Bottled water
Field hospitals
Relies completely on aid and recovery is slow – 1 year later
people still living in tents.
buildings destroyed and 1.3 million homeless
People went looting (stealing)
2 million with no water or food or electricity
Outbreak of Cholera from dirty drinking water
Case study: Earth quake MEDC Kobe, Japan earthquake 1995
Where?
South East Asia
What?
7.2 Richter on 17 January 1995
5.46am
Epicentre 20km south of Kobe in Osaka bay
14km depth so much ground shaking and soil
liquefaction
Effects
Short term:
Collapse of elevated roads and bridges e.g. 630m stretch
of Hanshin expressway collapsed
103,500 buildings collapsed
Only 20% buildings in CBD usable after earthquake – 62
high rise destroyed and only 19 rebuilt
Port facilities (30% Japans commercial shipping)
destroyed by soil liquefaction
Ruptured pipes and poles stopped city’s gas and
electricity
6300 deaths – 2900 more from suicides or neglect
35000 injuries
Area of Nagata badly affected – timber framed buildings
owned by poor were death traps
60% deaths were over 60 year old people
300 fires in city after gas pipes ruptured
300,000 immediately homeless – 20% of Kobe-
Responses:
State’s crisis management very poor
Inadequate communication between government and
administrators
People running through street hit by falling debris ignoring
fires
5 hr delay calling Self Defence Force / Army – only 200
troops
Only 21 Jan 30,000 troops
Took several days to designate disaster zone
3 days no electricity
Delays in accepting international help – US military based
in Japan, foreign medical teams and sniffer dogs
Kobe’s resident’s believed that not at risk
Improvements since then- recovered quickly
Solutions/management:
All school children now have earthquake and drills 4X per
year
Earthquake kits can be bought in department stores –
bucket, bottle water, food, radio, torch, first aid kit and
protective head gear
Earthquake Disaster Prevention Day 1 Sept every year for
offices etc.
Long term:
95,000 in temporary accommodation 1 year later
$99.3 billion damage and $120 billion needed for
reconstruction – only 7% had insurance
20,000 lost jobs
Businesses moved away – Kawasaki shipping and
Sumitomo rubber
Why live in a danger zone?
Fertile soil, limited transport to move away, family lives there; feel they are not in danger, tourism.
Unit 2.2 Weathering
Weathering is the break-up and decomposition of rocks in-situ (in their place of origin). Weathering
does not involve the movement of material and this makes it different to erosion.
Erosion is the carrying away of material by a natural force e.g. water, wind, glaciers
Mechanical weathering: (physical) breaking down of rocks due to temperature change or plants
(biological weathering)
Chemical weathering: decomposition of rocks by changing chemical composition such as rain
Biological weathering: Plants’ roots growing or animals burrowing into joints or cracks and force
apart or loosen the rock.
Unit 2.3 Rivers
The Water cycle:
The amount of water of earth never changes. It is only moved and stored in different ways.
-
-
Evaporation: when the temperature of water or air changes water is turned to gas and
rises into the atmosphere
Evapotranspiration: Plant suck up the water in the earth and then water can be
evaporated from their leaves called transpiration.
Condensation: water vapour blown towards mountains is forced to rise and then cools
into droplets of water which form clouds and fall as rain or snow. (precipitation)
Interception: some rainfall is intercepted (caught and absorbed) by plants or soil and
some flows on the surface of the earth. The water that is absorbed can saturate the land
and the water that run on top forms streams and rivers.
Overland flow: streams flow on top of the ground and join to form rivers which feed
into lakes and streams.
Load: The material carried by the river
Types of erosion:
Hydraulic action: the impact of the moving river
Types of river transport:
Solution: materials dissolved in the river water
Corrasion: (abrasion) the wearing away of the bed and
river bank by the load being covered
Suspension: very light materials carried near the
surface of the river
Attrition: the wearing away of the load as particles bump
together while being carried by the river
Saltation: large particles bounced along the river
bed
Solution: (corrosion) the dissolving of material by the river
water
Traction: heavy rocks and boulders rolled along the
river bed
River land forms:
Erosional land forms: shapes in the landscape formed by erosion
The river’s long profile:
Upper course:
Starts at the source
Valley sides are steep
Lots of vertical erosion
Heavy loads of boulders and large rocks
Water falls
Potholes
Interlocking spurs
Middle course:
Valley widens, slopes are not as
steep sand the gradient of the
river is less.
More lateral erosion (side to
side)
Meanders
Levees
Lower course:
River comes to an end and slows down
as it meets the sea or lake – mouth of
the river
Lots of deposition
Deltas
Flood plains
V shaped valleys
Flood plains
Oxbow lakes
Waterfalls
Falling water and rock particles wear
away soft rock
-
The hard rock is undercut as
erosion continues
-
Hard rock collapses and if moved
by the flow. The waterfall moves backwards
-
Erosion continues and the waterfall
continues to move upstream
leaving a gorge of recession
Interlocking spurs
In the upper course the river does not have a huge amount of energy to erode as it does not have a
high discharge and it has to transport large pieces of sediment.
When the river meets areas of harder rock that are difficult to erode it winds around them. A series
of hills form on either side of the river called spurs. As the river flows around these hills they become
interlocked. So, a series of interlocking spurs are often found in the upper course of a river valley.
V-shaped valleys
Formed by vertical erosion when
potholes grow and join together
eroding the rock beneath the river.
Potholes
Formed by large stones getting trapped in the river bed causing
corrosion which drills holes into rock bed which will eventually grow and
join together.
Rapids – places where the water is shallow and river bed is rocky and uneven. The water is rough
and the gradient is varied causing water to run faster. These can be used by white water rafters.
Meanders
Rivers with big sweeping bends with
water flowing in corkscrew motions
and causing lateral erosion on the
outsides of bends and deposition on
the insides.
Depositional land forms: shapes in the landscape formed by deposition
Floodplains
Land next to the river which is liable to flood. Often very marshy and poorly drained. River deposits
silt, gravel as it floods.
Meanders (inside of bends) – as above
Deltas
Area of flat low lying, marshy land where a river
meets the sea or lake. They can form their own lakes
or lagoons. The loss of speed means the river
deposits its load which is usually mud or silt. As this
deposition takes places parts of the river are cut off
leaving small lakes or lagoons. The river breaks up
into distributaries.
Oxbow lakes
Continued erosion on the outside of
meanders or in the neck of the river,
may cause two parts of the river to
create a shorter path for the water.
The deposition on the inside of the
bend may cause the old path of the
river to become cut off and a lake is
formed. An oxbow lake.
Levee
Naturally formed when rivers flood. When the river floods it loses energy and deposits its
load. This makes the banks of the river higher than the river or the flood plain. Sometimes
the natural levees occur and other times they are built to prevent against river flooding.
Creating meanders and oxbow lakes
In this picture, soil and mud is being eroded from various points on the
bank. It’s being transported in the direction of the white arrows and
deposited downstream (the sandy patches). This is changing the course
of the river
This picture shows the same river many years later, the erosion and
deposition have created such a deep meander that it has nearly formed a
circle
Eventually, the river erodes so much that it cuts off part of the meander
and creates an oxbow lake
Case study: formation of a waterfall Niagara Falls
Where?
Two waterfalls in the Niagara River between New York
State and Ontario, Canada
What?
Spectacular waterfall carrying 90% of the world’s water
12,000,000 visit every year
Producer of hydroelectric power
Benefits:
Money from tourism, hydroelectric power, fame, water
supply
How was it formed?
1. Glaciers melted 12,000 years ago
2. Melted water poured down into the great lakes
3. As the lake overflowed it caused the Niagara River
to flow downhill and fell down the escarpment
(cliff)
4. The rocks at the falls are made of different layers of
soft and hard rock
5. The soft rock (shale) was eroded from underneath
the hard rock (sandstone)
6. The water could now fall freely
7. The force of the water eventually eroded away so
much rock that the top rock was undermined and
fell
8. This process happened over and again and is still
happening!
9. This means that the waterfall is retreating every
year.
10. The force of the water falling creates a plunge pool
at the bottom of the falls.
Case study: Living by Deltas Ganges, LEDC, Bangladesh
Deltas: Where the river slows as it reached the sea a large amount of deposition takes place as the
load can no longer be carried by the force of the water. The load deposited causes the river to split
up into smaller distributaries which flow to the sea. The sediment dropped by the river is often very
fertile and therefore much vegetation grows there.
Where: Bangladesh, bordered with India
Delta is at the end of the Ganges river which
flows from the Himalayas
Advantages: flooding and irrigation all crops to
be grown all year round such as rice and
vegetables. Preferable to city slums. Jute (used
Formed: Deposition of load at the end of the
Ganges river as it arrives at the coast and slows
down.
How? A) River carries a large amount of silt
which builds up to form islands
B) As more silt builds up flooding occurs and
creates small distributaries (small little streams
winding to the sea)
C) Between these distributaries land is rich and
fertile
for making burlap sacks) is grown and there are
many fish to catch.
Disadvantages: monsoons (heavy rain fall),
cyclones (strong winds and rain), floods
Case study: Flooding of the Brahmaputra and Ganges Rivers, Bangladesh (LEDC)
Causes of 1998 flooding:
Effects in 1998:
Monsoon season- 80% of rain falls June to September
70% of land in Bangladesh affected
Deforestation in the Himalayas increases runoff below
2/3rds of people affected
Urbanization – building on floodplains
Dhaka 2ms deep in water
1998 both rivers peaked at the same time
Electricity supply cut off for several weeks
Silt had been deposited near the mouth blocking the
Wells contaminated and not safe for drinking
main channel
7 million homes destroyed
Global warming melting Himalayas
25 million homeless people
Poorly maintained embankments
1300 approximate death toll
Flat low lying land over 80% of Bangladesh
2 million tonnes of rice destroyed
Roads, bridges, airports and a third of the railway
destroyed
$1.5 billion damages
Management: (how to prevent it)
Since 1989 Bangladesh has been trying to:
Build 5000 flood shelters with stilts to save lives
Improve forecasting with satellite technology
Early warning system with megaphones
Build dams
Control water with sluice gates and water pumps
Heighten embankments on side of river to 7m- more than
7500km already in place
Case study: Flooding MEDC Boscastle UK
Where: Cornwall UK
When: 2004
What: settlement was left in ruins by floods
Short term Causes: intense rainfall caused local rivers to
burst their banks, heaviest rains in living memory, 185
mm fell in just five hours, three million tonnes of water
was added to a tiny drainage basin
Long term causes:
The soils were already saturated from previous rainfall
earlier in the week, encouraging overland flow to begin
Effects: motor vehicle damage, shops were carrying
greater levels of stock due to tourist season and were
lost.
No one died but property damage was high. At least
thirty cars were washed straight into the harbour and
many more were left upturned and badly damaged.
A three-metre high wave of water was reported to have
crashed through one street at 80 kilometres per hour.
Fridge-freezers were picked up and swept out of kitchens
as water entered properties. Six properties collapsed
even sooner.
The three river valleys are very steep and narrow. A
broader floodplain would have helped to soak up water
and river energy more effectively.
The steep valley sides mean that soils are thin, with
limited water storage capacity when heavy rain comes.
Surrounding vegetation includes agricultural land with
limited interception storage, although there is some
forestry along the riverbanks.
The rain coincided with high tide in the bay. This
restricted the rate of exit of floodwater into the harbour.
entirely.
Infrastructure disruption – Both bridges in the village
were destroyed and sections of road were swept away.
Telephone, water, electricity and gas supplies were all
interrupted.
Irreplaceable loss of historical artefacts – The ‘Witch
Museum’ – which is fifty years old and receives 50,000
visitors a year – had some of its unique contents
damaged.
Physical injury No-one died, but at least one resident
suffered a heart attack.
Mental injury Many residents suffered stress and anxiety
in the year that followed. It was six months before many
properties were sufficiently repaired for homeowners to
permanently return home.
Case study: Flood management: Responses to Boscastle floods
Case study: River management in MEDC: Mississippi River, USA
Where/what is it?
Mississippi is 3800km long
Flows through ten states
Has over 100 tributaries
Has a drainage basin covering 1/3 of the USA
Causes of 1993 flooding:
Heavy rain in April 1993 saturated the upper Mississippi
basin
Thunderstorms in June caused flashfloods
Mid July 180mm of rain in one day
Levees in nearby towns collapsed
Little task for you ….
Management:
6 huge dams and 105 reservoirs
Afforestation to delay runoff
Strengthening the levees with concrete mattresses
25mx8m
Making the course shorter and straighter - from 530km to
300km by cutting through the neck of meanders to get the
water passed towns more quickly to the sea
Diversionary spillways – overflow channels 9km long
Less construction on the floodplain e.g. St Louis.
Unit 2.2.3 Marine Processes
Coast: Where land meets the sea
Fetch: the distance the wind has travelled over the sea – the longer the fetch the bigger the waves
Constructive waves: swash is stronger than backwash causing deposition
Destructive waves: backwash is stronger than swash causing erosion
Marine transport:
Suspension
Fine sediment carried
in the water
Solution
Dissolved material
carried in the water
Traction
Large pebbles and
stones rolling along sea
bed
Saltation
Small pebbles hitting
one another and
bouncing along the sea
bed
Marine erosion:
Hydraulic action
Corrosion
Attrition
Corrosion
Long shore drift: The movement of sediment along the beach
Groynes: beach protection against longshore drift
Air forced between
cracks on rocks
Sea water dissolving
parts of rocks
Large rocks and
sediment in water
collide and wear each
other down
Large rocks and
sediment thrown
against the cliffs
Headlands and bays: Formed where there hard and soft rock. The soft rock is eroded away and the
hard rock is not.
Formation of caves, arches and stacks.
A line of weakness called a fault
appears in the rock
This fault increases in size until it
becomes a cave
The waves erode the cave until the
water breaks through the other side
creating an arch
The roof of the arch falls into the sea
creating a stack
The stack is eroded away to form a
stump
Case study: Coastal erosion: The twelve apostles Victoria, Australia
Where:
Port Campbell National Park, Victoria, Australia
Limestone cliffs formed in layers from the
sediment on the sea floor forming sedimentary
rock.
9 remaining stacks of rocks off the Victoria coast
Formed:
Headlands formed where the rock was harder
Hydraulic action, corrosion and corrosion eroded
along the fault lines
Cliff base eroded away to form WAVE CUT
PLATFORMS, notches, arches, caves and stacks
When the arches collapsed stacks were formed
Coastal deposition:
Beach
Large particles at the
top of the beach and
smaller particles like
sand lower down the
beach
Created when
deposition occurs
when the swash is
greater than the
backwash
Spit
Caused by longshore
drift
Deposition of sediment
where coast changes
shape or at the mouth
of a river, the beach
continues where the
land stops forming a
sand island going out
to sea. When one end
is attached to land it is
called a spit.
Case study: Coastal deposition: Hel Spit, Poland
Bar
If a spit connects two
pieces of land
(eventually) it becomes
a bar and the water
enclosed between the
bar and the land is
called a lagoon.
If this lagoon fills up
with sediment it
becomes a marsh. An
area of soft soggy land.
Salt marsh
The water has very
little energy and so
deposits more and
more sediment behind
a bar. Many plants can
grow here and help to
cause more deposition
or sediment and salt
from the sea becoming
a salt marsh.
Where: Baltic sea, northern Poland
Formed:
Result of longshore drift from west to east
NW wind and sea carries sediment and deposits
it along the east end of the beach
Protection:
Sea walls
Groynes
Beach replenishment –replacing the sand from the east of
the beach back to where it came from
Sand dunes:
Ridges of sand which form behind beaches.
An obstacle is formed by a plant or sand hill and this slows down the wind coming from the sea. Any
and or dust that the wind is carrying is deposited around the obstacle and it grows; like a sand dune.
Plants begin to grown there and their roots stabilise the dune so it become stronger.
Over time the dune become grey as plants die and they decay leaving behind humus.
Eventually the plant life grows and the sand is able to hold more water and trees can now grow
here, transforming it into part of the earth.
Coral Reefs:
What is coral?
The solid skeleton of limestone
It grows in warm water 23-25°
Grows in clear shallow salt water
Needs plenty of sunlight
How are they formed?
Large amount of coral build up over a long period of time and get higher and higher.
They begin building from a rock base in the ocean
There are THREE different ways this can happen and therefore THREE different types of coral reef.
Biodiversity: Coral reefs contain a very large amount of different species of plants and animals.
Many of these are now becoming endangered species due to human impact
Threats: earthquakes, cyanide bombs used for fishing, humans standing on the coral
Case study: Coral Reef: Great Barrier reef, Australia
Where: Great Barrier reef Marine Park, Australia
National park since 1981
Only 100 meters deep and in some places less really
close to the Australian coast.
Economic importance:
6% of Australian workforce work here
12% of country’s exports come from here
Natural threats:
Starfish: warmer seas has seen the starfish move to new
areas, eating more algae and coral and leaving white coral
skeletons
Solutions:
World heritage site – now managed under particular laws
to protect from pollution, fishing and tourist damage
Threats:
Human:
Agriculture: Pollutants from agriculture
Zoning – only particular activities allowed in each zone
Industry: metal pollutants, phosphates and nitrates from
sewage and 34industry
Fishing: Over fishing and cyanide bombs used to stun fish
kill marine life
Dredging: Sand and gravel taken from the sea for
building muddy the waters and reduce the amount of
sunlight needed for the reef to survive
Tourism: Ships, yachts and boats bring tourists who tread
on and kill the reef
Advice – tourist advised on how to preserve the reef
e.g. no standing on the reef, no feeding the fish, no
smoking
Coastline development: Housing on the coast line brings
greater demand for building materials taken from the sea
Unit: 2.3.1/2 Weather and Climate/ ecosystems
When we wake up in the morning one of the first things we are interested in is the weather.
Weather is the condition of the lower atmosphere* at any particular time. If there were no
atmosphere there would be no weather. The moon has no atmosphere and no weather.
* The atmosphere is the layer of gases, called air, which surrounds the planet earth.
* The air in the atmosphere is a mixture of gases. These are mainly nitrogen (about 4/5) and oxygen
(about 1/5). There are also amounts of water vapour, carbon dioxide and some rare gases. The
amount of water vapour is very important as this gives us our cloud and rain.
The components of the weather
To describe the weather we must describe the state of the air. We can do this under 6 main
headings. These are called the elements of the weather:
1. air temperature - How hot or cold is it?
2. precipitation (rain, snow, hail, sleet, frost, fog, dew) - Is it wet or dry?
3. cloud cover and sunshine - Is it sunny or cloudy?
4. wind speed and direction -The movement of the air.
5. air pressure
6. Humidity – how much moisture there is in the air
The climate of a place is its average weather. To calculate this we must know what types of weather
occur there at different times of the year.
Air Temperature
We measure the temperature of the air in degrees Celsius (ºC) using a thermometer.
EQUIPMENT NAME
PHOTO
DESCRIPTION (WHAT DOES IT MEASURE)
Stevenson Screen
A Stevenson screen is basically a white louvered wooden
box. The box is designed to contain some weather equipment
like thermometers and barometers. The Stevenson screen is
white to reflect sunlight and has slats to allow air to circulate
easily. The Stevenson should be placed above the ground
and away from the buildings. The idea is for the weather
instruments to take accurate readings of the air, rather than
direct sunlight or heat from the ground or from buildings. For
more detailed information about the siting of a Stevenson
Screen, read the attached document.
Barometer
Barometers are used to measure air pressure. Air pressure is
normally measured in millibars. Barometers are normally kept
inside Stevenson screens to keep them safe. A barometer
has a movable needle (pointer). The pointer can be moved to
the current reading so that you can then make a comparison
with the reading from the following day.
Max./Min. Thermometer
(sometimes called a Six's
thermometer after its inventor)
A maximum and minimum thermometer records the maximum
temperature of the day and the minimum temperature of the
day (diurnal range). A maximum/minimum thermometer
contains a mixture of mercury and alcohol. The mercury sits in
the u-bend of the thermometer. The bulb at the top of the tube
reading the minimum temperature contains alcohol and the
bulb at the top of the tube reading the maximum temperature
contains a vacuum. On the minimum side the expansion of
the mercury is restricted by the contracting alcohol, on the
maximum side the expanding mercury can expand more
freely into the vacuum. At any given time both thermometers
should record the same temperature. However, during the day
they would have recorded the maximum and minimum
temperature - a steel marker should indicate these
temperatures.
Wet/Dry Bulb Thermometer
(hygrometer)
A hygrometer measures the humidity of the air. Humidity is
the amount of moisture (water vapour) in the air. A
hygrometer has two thermometers, a dry one and a wet.
Humidity is measured by using a table that looks at the
difference between the wet bulb and the dry bulb. A
hygrometer can also be used to find dew point. There is a
difference between the dry and wet bulb thermometers
because of latent heat created during the process of
evaporation.
Rain gauge
Rain gauges are used to measure rainfall. Rainfall is normally
measured in millimetres. Rain gauges should be placed on
grass, because if they are placed on concrete, extra water
can splash into them. Rain gauges should also be checked
regularly to avoid evaporation.
Wind Vane
Wind vanes are used to check the direction of the wind.
Compass points are used to give wind direction. Wind is
measured in the direction that the wind is coming from. Wind
vanes are often placed on top of buildings so that they are
fully exposed to the wind. When using a wind vane you need
to use a compass to make sure that it is properly aligned.
Anemometer
Anemometers measure wind speed. Wind speed is normally
measured in mph or kph, but can also be measured in m/s
(metres a second). Digital anemometers are very accurate,
but the more basic plastic ones that many schools have aren't
very good or accurate at recording light winds. Anemometers
are normally placed on top of buildings so that they are not
protected from the wind and so they don't experience
channeling of wind e.g. if an anemometer was placed in a
corridor where wind was forced through the readings would
be higher than normal.
Cloud Cover
It is also possible to count day light hours, sunshine hours or
cloud cover. To Calculate day light hours you need to record
the time between sun rise and sun set. To Calculate sun
shine hours is a lot harder, because you have to time every
time the sun comes out (stopwatch). To calculate cloud cover
a mirror is often used. You divide the mirror into squares and
then place the mirror on the ground. The mirror will reflect the
clouds and you can count the number of squares covered or
partially covered by cloud. You can do this as a percentage or
convert to oktas which is the normal measurement of cloud
cover. You have to take several readings to avoid anomalous
results.
On a weather map we join places of equal pressure with lines called isobars e.g.
A High Pressure Area
a Low Pressure Area
The weather we get from high air pressure is very different from that we get with low air pressure
Cloud types and extent of cloud cover
Clouds
Clouds are a collection of water droplets or ice crystals. The warmer the air temperature, the more
water vapour (gas) that the air can hold. However, when the air starts to cool, water vapour starts to
condense as long as it has condensation nuclei to condense around.
Cirrus
Found high in the atmosphere – usually over 5,500 metres
Common throughout the world
Thin and wispy in appearance
Move fairly quickly
Stratus
Low level – below 2000m and sometimes reaching ground.
Usually grey and colour and move fast.
Can produce light rain and snow.
Cumulonimbus
Large clouds up to 10km high and across.
They resemble giant cauliflower.
Produce rain, thunder and lightening
Usually found in spring and summer
Cumulus
Fairly low clouds with bottom between 600m and 1200m
Look like lumps of cotton wool
Can produce light rain
Individual clouds have a short life cycle
Climate zones and graphs
Climate zones around the world depend on a variety of factors but more or less we can se they are
dependent on the lines of latitude around the earth as the further away or closer we are to the
equator will affect the temperature we experience.
See blow for the climate zones and the factors which can affect the climate within one country.
Climate graphs show us the climate
over a year of different areas in the
world.
800
700
600
500
400
300
200
100
0
They concentrate on rainfall and
temperatures and you must be careful
to be sure you can use the following
terms to use terms to explain climate.
35
30
25
20
15
10
5
0
J F M A M J
J A S O N D
Month
Temp (oC)
Rainfall (mm)
Climate Mumbai
-
Range of temperatures
Maximum and minimum
temperatures
Annual precipitation
Minimum and maximum
precipitation
You must also be able to name the type
of climate from climate graph.
e.g. tropical, arid, Mediterranean
Factors affecting climate:
Eco systems
Ecosystems: A biological environment consisting of all the living organisms within a particular area
and the non-living that interact with the organisms e.g. weather, soil, air and water.
Tropical rainforest climates: Features of a rain forest environment:
-
mostly found along the equator
hot temperatures all year round
Plenty of rain, over 1500 mm in some areas
10% of worlds rainfall depends on evaporation and transpiration from these rain forests
Ever green forests with broad leaved trees
Lots of flora and fauna (can be 40-100 tree species per hectare)
Large amounts of shade at low levels
Most plants grow up high where they can get to the light
Plants that reach the sky are called emergent and they can create their own islands in
the canopy of the forest called the ‘lungs of the Earth’ as they produce oxygen.
Low pressure weather allowing clouds to form and rain occurs all year but in varying
amounts.
Location of Rainforests







The Congo Basin in central and west Africa
The Amazon in Brazil, Peru, Bolivia and Ecuador
SE Asia (Malaysia, Thailand, Vietnam, Indonesia and the Philippines)
Madagascar
North east Australia
Southern India and Sri Lanka
Central America
Tropical Rainforest Animals
Tropical rainforests have a huge amount of biodiversity within them - some estimates suggest that
up to 50% of the earth's biodiversity live there (flora and fauna). The are many big famous mammals
like tigers in SE Asia, jaguars in Central and South America and leopards in Africa. However, there are
also much smaller mammals like sloths and primates like lemurs that live in rainforests. All mammals
and primates have adapted in different ways to survive in the rainforest e.g. camouflage. As well as
mammals and primates there are many other animals like birds, amphibians, reptiles and insects.
Many rainforest animals are under threats. Threats include:






Habitat loss (deforestation)
Climate change (reduction in rainfall or increases in temperature)
Pollution (especially reptiles and amphibians)
Hunting (food food, skins and parts for Chinese medicine)
Cross breeding with domestic animals
Diseases (bird flu)
Case study: Human impact on tropical Rainforest climate: Madagascar
Where and what:
LEDC
9th poorest in the world
4th largest island in the world
Unique eco system and food chain
Nearly all the land was once forest
Gradually more and more land used for farming
leading to deforestation
The rainforest is disappearing.
Problem:
Cash crops being planted like rice and coffee
These make lots more money for the country
But the forest is being removed to plant more and more
The eco systems within the forest are dying and cannot be
replaced
Removing trees is done by burning them
The ash (which contains the trees nutrients) can be washed
away into rivers
Crops cannot grow in infertile soil
Animals lose habitats and humans must move their crops to
anew area when the soil become infertile.
Dispute!
People claim they need to earn a living
The need to hunt the animals there for food and clothing
They want their economy to develop
Deserts
Antarctica is sometimes classified as a desert because it actually has very low levels of precipitation.
However, when we talk about deserts in this section of the desert we mean sandy deserts.
Distribution of Deserts
Deserts are located near the tropics (Tropic of Cancer and the Tropic of Capricorn). Some of the
world's most famous deserts include:
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Sahara in Northern Africa
Kalahari in Southern Africa
Atacama in South America
Gobi in Central Asia
Arabian in the Middle East
Great Victoria and Great Sandy in Australia
Mojave and Chihuahuan of North America
Desert Climates
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Deserts are extremely dry (arid) places. True deserts normally have less than 250mm a year
although some deserts like the Atacama to the right can go years without any water.
Deserts are very dry because the air that descends over them is very dry. The air is dry
because most of the moisture has fallen as precipitation over the Equator (tropical rainforests)
before being pushed out and falling near the tropics.
The air is also very dry because the air travelling from the equator to the tropics travels over
land and not the sea. This means that no additional moisture is picked up.
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Because there is no moisture in the air, there are very few clouds in deserts which means
desert areas are exposed to high levels of incoming radiation from the sun. This means that
daytime temperatures in the desert are very high.
However, the lack of cloud cover also means that a lot of outgoing radiation is able to escape,
making desert temperatures very cold at night. So even though the annual temperature range
in deserts is very low, the daily temperature range is very high.
The daily temperature range is known as the diurnal temperature range.
Desert Fauna and Flora
Because of the very arid conditions found in deserts, both plants and animals have had to adapt to
survive. Adaptations include:
Succulents e.g. cacti: Succulents tend to be fairly fat fleshy plants that are able to store water in
their leaves, trunks and roots.
Ephemeral: These are plants with very short life cycles - typically 6-8 weeks. This means that they
can take advantage of very short wet seasons in order to pollinate.
Long and wide roots: Plants in deserts have very long roots so that they are able to absorb the
maximum amount of rainfall during periods of rainfall. It also makes them more stable in very lose soil.
Spiky and waxy surface: Many plants like cacti protect themselves with spikes and wax so that they
are not eaten or damaged by animals.
Deserts don't have the same variety of animals as tropical rainforests, but many insects, reptiles and
mammals have adapted to survive.
Nocturnal: Many animals will hide in burrows or behind rocks and vegetation during the hot daylight
hours and only emerge at night.
Camels: Camels store fatty tissue in their humps which when metabolised actually releases water as
well fat enabling them to survive in deserts.
Human Causes of Desertification
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
Physical Causes of Desertification
Overgrazing: Allowing too much livestock to graze on a piece of land  Rising Temperatures: As global temperatures
which means all the vegetation is eaten making the ground susceptible to increase it is becoming increasingly hard for
wind and water erosion.
vegetation to grow thus reducing vegetation
Overcultivation: If you farm land to intensively and don't have fallow
cover and increasing the risk of wind and water
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periods then all the nutrients in the soil get used.
erosion.
Deforestation: Cutting down trees which not only means the land will be Falling Rainfall: As the amount of rainfall
receiving less nutrients, but it also means it is more vulnerable to erosion reduces in some areas like the Sahel, then it is
because there is no interception and less stability because the root
increasingly hard for vegetation to grow again
systems have been removed.
making the ground more vulnerable to wind and
Overpopulation: As the world population continues to grow (now about water erosion.
 Flash floods: Intense periods of rainfall can
7 billion) the demand for agricultural products (crops and meat) is
increasing, causing more land to be deforested, overcultivated and
also cause erosion of topsoil which leads to
overgrazed.
land degradation.
Fertiliser and Pesticide Use: By using fertilisers and pesticides you can
 Wind: If a region is particularly windy then the
artificially increase yields of crops. However, the process is unnatural and amount of wind erosion is likely to increase.
prolonged periods of use can all naturally produced nutrients to be used
and local water sources to become polluted reducing the ability of land to
cultivate crops and therefore making it vulnerable to chemical
degradation as well as wind and water erosion.
HYV and GM Crops: Like with fertilisers and pesticides, it is argued that
HYV and GM crops have encouraged overcultivation, diminishing natural
nutrients in the soil.
Unsustainable Water Use (aquifer depletion, unsustainable
irrigation): If aquifers or rivers are used unsustainably then areas can
become increasingly arid as water resources are used up. A classic
example of unsustainable irrigation happened in the Aral Sea.
Toyotarisation: This is basically the increased use of 4x4s to travel
across grasslands, deserts, etc. damaging topsoil and increasing wind
and water erosion.
Case study: Tropical Desert Climate / desertification: The Sahara and the Sahel, Africa
Where and what:
 The Sahel is a narrow belt of semi-arid land
South of the Sahara in Africa
 Rainfall is only in 1 or 2 months of the year
 Rainfall is irregular with no rain in some years
 Droughts in Ethiopia (1983), Sudan (1984-91) and
Somalia (1990s)
Effects of desertification:
Desertification has caused many problems in the Sahel
including:
Causes of desertification:
 Climate change and global warming allow less
rain per year
 Water holes dry up
 Increased population growth – 3 or 4%increase
each year
 Overgrazing of cattle, camels, goats etc.
increased 40% since 1980s
 Animals taken to wells which decreases height of
water table
 Non drought resistant grasses die
Solutions:
A number of solutions have been suggested to solve the
problem of soil degradation and desertification including:
A giant shelter break (the Green Wall) - see article to the
right
Population control
Finding alternatives to firewood e.g. solar cookers
Improved farming techniques e.g. reduced grazing
numbers
Famine
Dust storms
Conflict over diminishing resources
 Farming on marginal land
 Farming the same crop each year
 Lack of fallow land
 Taking local trees for firewood
All these increase the size of the desert, increase soil
erosion and cause famines for people
Unit 2.3.3 Natural Hazards
Case study: Drought: Australia MEDC – Murray Darling Basin
Where and what:
MEDC in southern hemisphere
Driest continent in the world
Since 2002 worse drought in 200 years
Murray-Darling river runs from the snowy mountains to
Adelaide in South Australia
River water is used for irrigation of farm land
Not enough rainfall to keep the reservoirs full
Not enough water for urban populations
Desert and semi-arid climate
Effects:
Fall in population in Bourke in New South Wales because
of drought
Towns are facing economic and social ruin as crops fail
and there is not enough water to supply the towns
Options are to move of to try and make a living from
tourists who go there to see the ‘outback’
Bush fires and homes destroyed due to lack of water
Responses:
Water restrictions put on citizens
Fines or imprisonments for using too much water
Case Study: Drought Ethiopia LEDC
Where and what:
Ethiopia is one of the poorest countries in the world
1983-84 saw the worst drought ever
Cause:
Rainfall level was considerably lower than average
Famine caused as civil war and poor roads made it
difficult to transport food
Effects:
Farmland dried out
Animals died and crops failed causing widespread
starvation and illness
500,000 people died
Millions of people needed food from MEDC charities like
Oxfam and Band-Aid
People migrated to other areas or refugee camps
People malnourished
People living in poverty
Tropical Storms
Tropical storms take different names in different parts of the world. In The Caribbean, US and Central
America they are known as hurricanes, in the Indian Ocean they are known as cyclones and in the
Pacific around the Philippines and Indonesia they are known as Typhoons. Tropical storms are
normally found between the tropics near the Equator. The formation of tropical storms is not fully
known, but scientists do know that they draw their energy from warm seas. Therefore tropical storms
tends to happen in late summer when temperatures are warmest (over 27 degrees Celsius). Because
tropical storms get their energy from the sea, when they do hit land they lose their energy quickly.
Most tropical storms last between one and two weeks. The main hazards caused by tropical storms
are:
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Winds: Very strong winds up to 250km/hr accompany tropical storms. Strong winds can damage
buildings, knock over trees and disrupt transport and communications
Flooding: Heavy rainfall is associated with tropical storms. Heavy rainfall actually causes much more
damage and deaths than high winds.
Storms urges: Tropical storms moving in land can create storm surges and big waves. If tropical
storms coincide with spring tides the impacts can be severe.
Landslides: Landslides are a secondary hazard. Landslides can be triggered when large amounts of
rainfall saturate the ground increasing the stress on the slope.
Tropical storms are measured on the Saffir-Simpson Scale. The Saffir-Simpson currently has five
categories, although some meteorologists believe a sixth category should be introduced to describe
super hurricanes. Storms below 74mph (119kph) are described as only tropical storms. Anything
above this speed is officially a hurricane/cyclone/typhoon.
Case study: MEDC Tropical Storm: Hurricane Floyd, USA 1999 (MEDC)
What and where:
 Formed in Atlantic Ocean off coast of Africa
 Began 2 September 1999
 Cat 4 hurricane (211-240 kph) in Bahamas by 13
and 14 September
 Weakened by time reached USA near Cape Fear, N
Carolina
 Tropical storm by time reached New England
Effects:
 14 states (Florida to Maine) hit – N Carolina worse
hit
 79 deaths
 47 people died from storm of 500mm rain and
floods in N Carolina
 4 million evacuated in N Carolina, Georgia and
Florida
 1 million had no electricity or water
 4,000 Pennsylvanians homeless
 25000 claimed insurance - $460 million
 42973 homes damaged – 11779 destroyed
 144854 asked for assistance
 10x increase in Alabama benefits applications
 105580 people went to shelters
 $1 billion agricultural losses -10% N Carolina
tobacco lost
 N Carolina 500 roads impassable
 Storm surge in Nassau sunk boats
 Beaches in Bahamas destroyed – Wrightsville beach
20m sand on roads
Prediction
 National hurricane Centre in Florida government run
 Use geostationary satellites
 Allowed 2.5 mil to be evacuated
 N Carolina 800,000 evacuated – caused traffic on
Interstate 26
 150km journey took 10 hrs
Preparedness/Buildings/Land use planning
 Federal Emergency Management Agency (FEMA) gave
advice for family disaster plan and disaster supply kit
 Building codes to construct earthquake proof
buildings – not always applied though
 High risk coastal locations identified based on past
hurricanes and surges
 Building limited here
Case study: Effects of LEDC Tropical Storm: Cyclone Myanmar
Where and what:
Asia
LEDC
May 2008
Winds up to 300 km/hr
Heavy rain causes flooding and mudslides
Short term Effects:
Blew roofs of houses, schools and hospitals
Cut electricity to whole cities
In Bogdale, 3000 reported dead or missing
Blocked roads
Broken telephone wires
Casualties unknown but estimated at 140,000 killed or
missing
Residents and Buddhist monks cleared the roads by hand
People had to wash in lakes and queue to buy candles
and water to drink.
Long term effects:
75% of homes on the Irrawaddy Delta were made
homeless and is an area that is very important for
exporting fish and rice and feeding the country.
The country could not export any goods
Petrol was scarce so bus fares went up and people could
not afford to get to work
Sanitation plants were flooded and therefore disease
spread more quickly
Response:
It was not reported in the news and they claimed they
could recover without help from MEDCs
Unit 2.2.4 Human impacts / national parks
Importance of Tropical
Rainforests
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Reasons for Deforestation
Problems Caused by Deforestation
Biodiversity: Although
 Cattle Ranching: As the world's
 Flooding: Flash floods become more
rainforests cover only about
population gets bigger and richer, the
common after deforestation because there
5/6% of the world's land mass, it demand for meat is increasing. To rear is less interception and less root uptake and
is estimated that they could
the cattle increasing tracts of the
transpiration. As such rainwater reaches the
contain up to 50% of the world's rainforest are being cleared to make
ground quick, saturating it and causing
biodiversity. This is potentially up pastures for grazing.
surface run-off and potential flooding.
to 15 million species.
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 Subsistence Farming: Because of the
 Landslides: By removing trees and
Photosynthesis: Tropical
large amounts of poor people that still
vegetation, you are making the soil less
rainforests are often referred to live in tropical areas, subsistence farming stable. Combine this with saturated ground
as the 'lungs of the earth' and
is still widespread. Because rainforest
and the likelihood of floods increases.
convert large amounts of the
soil loses its fertility quickly after

greenhouse gas carbon dioxide deforestation, the most common form of Biodiversity loss: Because all the species
back into oxygen. It is estimated subsistence farming is slash and burn. that live in the rainforest are not known it is
that the Amazon rainforest alone With growing populations this method of hard to calculate species loss. However,
produces about 20% of the
farming can cause widespread
scientists believe that 1 mammal or bird
earth's oxygen.
deforestation.
extinction can be extrapolated to

approximately 23,000 extinctions.
Flood control (interception,  HEP: Many of the world's great rivers 
transpiration): Rainforests are flow through rainforests e.g. the Amazon.
 Reduced photosynthesis: As more and
an excellent natural measure to
reducing flooding. There is leaf
cover in rainforests all year so
interception continually happens,
extending rivers lag time. All
vegetation uptakes water and
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transpires it.
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These great rivers often have the most more trees are removed the rate of
HEP potential. Unfortunately when a dam photosynthesis reduces, releasing more
and reservoir are built it causes damage carbon dioxide into the atmosphere and
during construction, but also floods large contributing to the greenhouse effect.
areas.
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 Silting of rivers: With increased flooding
Mining: With an ever increasing demand and surface run-off moil soils and silt is
for the world's natural resources,
washed into rivers, this can not only change
Control of soil erosion: The
countries and companies are looking at local ecosystems (water temperature and
root systems of trees and shrubs increasingly isolated locations, places
clarity) but can also reduce the depth of
hold the very thin soil of
like rainforests and Antarctica. The
rivers making navigation harder.
rainforest in place. If trees are
rainforests are believed to have many Silting of seas and oceans: With the
removed then both erosion of
resources including metals and fossil
increased frequency of flooding and
topsoil and landslides are more fuels beneath their soils. Gold mining can landslides more silt gets washed into the
likely
be particular damaging as mercury is
oceans. The increased amount of silts
used in its extraction and often runs off reduces the transparency of the sea
Source of nutrients to humus into rivers.
reducing the light reefs receive and the
layer in soil: The topsoil in 
temperature of the water. Increased silt can
 Road building: Building new roads like also block important shipping lanes.
rainforests is very thin and relies
on the nutrients provided by
Trans Amazon highway from Brazil to 
rotting plants and animals.
Bolivia not only causes deforestation  Breaking of nutrient cycle: The top soil of
Because of the rainforests
itself, but its also opens up new areas to rainforests is very thin an receives the
climate, there is a constant
urbanisation, mining and farming causing majority of its nutrients from rotting flora and
supply of leaf litter.
further deforestation.
fauna. Be removing trees you also remove

animals and therefore the source of the soils
Medical remedies: Rainforests
 Urban growth: With the world population nutrients. With increased erosion the top soil
have been the source of many of increasing as well as rates of
(humus) layer is quickly washed away.
today's drugs, including the basic urbanisation increasing many cities like

ingredients for the hormone
Manaus in Brazil are growing rapidly  Sandification/desertification: Because
contraceptive pill, quinine (a anti- causing deforestation.
rainforest soil loses its fertility very quickly
malaria drug) and curare (a 
after deforestation it quickly becomes hard
 Population growth: As populations
paralysing drug).
to grow any vegetation on it, leading to
grow, particularly in countries like Brazil, sandification and possibly desertification.
Cash crops and agricultural
Peru, India and Vietnam that contain 
products: Yam, coffee, rubber, rainforests the demand for land
 Loss of indigenous homes: By clearing
mango, banana, sugarcane,
increases, both to grow food and to live). rainforests you are obviously destroying the
cocoa and avocado were all first

homes of indigenous groups. But also
 Plantations: Primary products are often moving close to indigenous groups can
discovered in rainforests.
seen as an income source for LEDCs,
spread disease and alter local culture and
Ecotourism: With people
many of who have large areas of
traditions.
becoming ever more
rainforest. At the same time with fossil
 Reduced rainfall: Deforestation can lead to
environmentally conscious and fuels running out, alternative fuels
looking for increasing
sources are been searched for including reduction in local rainfall because less water
adventures, ecotourism to
biofuels e.g. Palm oil. This has lead to
is intercepted and transpired from
rainforests is increasing. This not widespread deforestation in countries like vegetation into the atmosphere reducing the
only helps protect rainforests, but Malaysia and Indonesia to plant cops like formation of clouds and rainfall.
creates income for locals.
palm oil.
Ecotourism is an important 
income to countries like Costa
Rica and Belize.
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Timber (hardwoods): Hardwoods like
mahogany and teak that take hundreds
of years to grow are still in high demand
Home to indigenous
to make things like furniture. The
groups: Although the number of extraction of these trees can kills trees
indigenous groups and people
around them. Also many countries like
have declined rapidly since
China are also demanding large amounts
colonisation in South America, it of normal timber that are not always
is estimated that there are still
taken from sustainable sources.
over 200,000 people that

consider the Amazon their home.
 Hunting: Hunting takes two forms, one
form is for bushmeat to feed families and
enough the sale of animals either alive
e.g. parrots or dead for their skins e.g
jaguars.
Case study: Deforestation of Tropical Rainforest: Amazon Rainforest, Brazil
Where and what:
Brazil, Peru, Bolivia – South America
1/3 of the world’s trees in Amazon
Estimates that 15-40% has been cleared
Effects:
 30000 known species could be threatened
 May lose species that are as yet undiscovered
 Could lose the cure for diseases like Aids and
15 football pitches per minute cleared for:
 Slash and burn farming by Amerindian tribes like
the Yanomami
 Subsistence farming by 25 million landless
peasants
 Commercial cattle ranching for fast food chains
 5300km Amazonian highway
 900km railway line from Carajas to the coast
 Timber/ logging companies
 Mineral mining e.g. diamonds, gold
 HEP
 Settlements e.g. Carajas
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cancer e.g. periwinkle found to cure Leukemia
Loss of Amerindians due to European diseases
Loss of Amerindian traditions
Soil erosion as lack of interception as canopy
removed
Loss of nutrients in soil
Climate change and global warming
Global balance of carbon and oxygen affected
Ways to protect Amazonia:
 Zones for different activities
 Loggers use selective logging practices
 Laws
 Limit licenses to be given out
 Restricting use of heavy destructive machinery
 Encourage logging-uses helicopter
 Community forestry development scheme to
educate local people
 Avoid construction where local tribes exist
 Fines and prosecution for law-breaking
 Increased patrols
Case study: Sustainable Rainforest Scheme: Costa Rica
Where and what:
Central America
29 National Parks covering 12% of landscape
Protect 208 species of mammals and 850 species of
birds
9000 different plant types
Park contains volcanoes, caves and tropical forests and
beaches
Benefits:
Brings many tourists, scientists and nature lovers which
boosts the local economy
Parks are managed so the environment is not damaged
and is SUSTAINABLE
Problems:
As it is very famous many people come to visit and this may
need to be controlled in the future to limit excessive
tourism
BUT if you limit the numbers then less money will be made
and nature will become exclusive
Need to educate people so as not to affect the park’s eco
system
Facilities are needed to cater for the tourists such as toilets
and campsites
Exam Style questions
Unit 2.1 to 2.6 IGCSE exam 5 marks describing/explaining and 7mark case study questions:
Unit 2.1 Plate Tectonics
Describe what can be done to protect people from volcanic eruptions. (4)
Suggest how volcanoes are likely to benefit the people who live in countries such as Iceland.(5)
Explain why people live in areas where there are active volcanoes. (5)
Why do many people live in areas which are at risk from earthquakes? (5)
Name an area which you have studied where there has been an earthquake. Describe the impacts of
this earthquake. (7)
Unit 2.2.2 Rivers
Describe the advantages and difficulties for people of living close to a river (5)
Describe and explain how an oxbow lake is formed. You should use label diagrams. (5)
Explain how and why a delta has formed in a named area which you have studied. You should use a
labelled diagram or diagrams in your answer. (7)
Explain the change in the shape and characteristics of a river as it travels from source to mouth (7)
Unit 2.2.3
Marine processes
Explain how headlands are formed along some coasts. (4)
Explain why coral reefs are only found in some sea areas. (5)
For a place you have studied, explain how humans have an impact on a coral reef. (7)
Unit 2.3.1 – 2.3.4
Weather and Climate / Ecosystems / Natural hazards / Human impact
The thermometers used at the meteorological station are kept in a Stevenson Screen. Explain how
this ensures that reliable readings are obtained. (4)
Give reasons for the climate of an area of tropical rainforest such as Kisangani. ? (5)
Explain how the natural vegetation of tropical desert areas can survive in the hot, dry climate. (5)
Another type of natural environment is tropical rain forest.
Describe the impact of human activity on a tropical rain forest ecosystem which you have studied.
(7)
Explain why the effects of tropical storms of the same strength are likely to be greater in an LEDC
than an MEDC. Refer to examples which you have studied. (7)
An earthquake is an example of a natural hazard. Choose an example of one of the following: a) a
tropical storm, b) a drought. For a named area, describe the causes and effects of your chosen
hazard. (7)
For a named area which you have studied, describe the impacts of a tropical storm. (7)
Name an area of tropical rainforest which you have studied and explain why deforestation is taking
place there. (7)