Population
Chapter 4 Section 2
7th grade Social Studies
Define:
• Population
• Population density
• Migration
What is population?
• The total number of people in a given area
• Population influences businesses,
transportation, and schools
• Geographers are interested in population
patterns that emerge over time
Population Density
• A measure of people living in an area
• Per square mile or kilometer
– Japan has a high population density
– Australia has a low population density
High vs. Low Population Density
• High = expensive land, crowded roads, taller
buildings
• Low = open spaces, less traffic, more available
land
Population Density Map
• What do you think the different colors mean?
Where People Live
• Areas with low populations = land does not
provide good life
– Mountains, harsh deserts, frozen ground
• Areas with high populations = fertile soil,
reliable sources of water, good agricultural
climate
Tracking Population Changes
• Three key statistics to learn about population
changes
• Birthrate, death rate, rate of natural increase
• Birthrate – death rate = natural increase
Natural Increase Rates Around the
World
• USA and some European countries have a very
low natural increase rate
• Russia has more people dying than being born
= negative natural increase
• Mali has a very high natural increase
– Population expected to double in 20 years!
What are some problems countries
with high natural increase rates may
face?
Migration
• Migration = the process of
moving from one place to
live in another
• Push factors = warfare,
lack of jobs, lack of good
farmland
• Pull factor = opportunities
for a better life
World Population Trends
• Since 1800 better health care and improved
food production have supported tremendous
population growth
Trends
• 1st trend = population of
industrialized areas is
slowing
– Germany, France
• 2nd trend = Less
industrialized countries
often have high growth
rates
– Affect workforce,
government aid
Population clock
• What is the current US population?
• What is the current world population?
• Click on World POPClock Notes. Scroll to the
bottom and click on Worldpop and then
click on World Vital Events Per Time Unit.
How many births are there per second in
the world? How many deaths per second?
• What is the natural increase per second in
the world?
Answer Questions on pg 90:
•1. a (look at map on page 87 –
find specific places)
•1. c
•2.b
7 billion People
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