Natural Disaster
BY SHAIMAA ELZEINI
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What is a natural disaster ?
A natural disaster is a
major adverse event
resulting from natural
processes.
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Natural disasters are
tremendous forces of
nature that have been
known to destroy cities and
towns all over the world.
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Some of the most wellknown natural disasters
that have happened every
year are volcanoes and
earthquakes.
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Trophy Time
What does it mean to say an earthquake is a
natural disaster?
A.
It was man-made
B.
It is a disaster caused by nature
C.
It is a disaster from the sky.
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Let’s look over some information
Natural disasters are tremendous forces of nature
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Let’s look over some information
Natural disasters are tremendous forces of nature
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Volcanoes
What are volcanoes? Please click on the image to watch the video before
moving on
http://www.schooltube.com/video/82dab119f64822786fe1/Volcanoes
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• Volcanoes are
mountains, but they
are different from
other mountains.
• They are built by
accumulation of their
own eruptive
products.
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A Volcano Defined
A volcano is a land form
where molten rock erupts
through the surface of the
planet. Gases and rock shoot
up through and spill over
with lava fragments.
http://www.schooltube.com/video/fd
866c529a9649f66be4/Volcano%20Er
uption
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Trophy time!
What is a volcano?
A land form where molten rock erupts through the surface of the
planet.
A sudden shaking of the earth.
A vast tropical storm that has winds whipping
around.
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You Did
Great!
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Sorry, a sudden shaking of
the earth is an earthquake
Let’s try again!
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Sorry, a vast tropical storm
that has winds whipping
around is a hurricane .
http://www.youtube.
com/watch?v=R0Zbj7
S22zs
Now ,Let’s
Try again.
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The word "volcano" comes from the little
island of Vulcano in the Mediterranean Sea
off Sicily.
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A volcano as seen by the eyes of a
child
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Types of volcanoes
Volcanologists have classified volcanoes into groups based on
the shape of the volcano, the materials they are built of, and
the way the volcano erupts.
volcanic
material:
lava, rock
fragment,
and gas
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Volcano Groups
•
Composite Volcanoes
•
Shield Volcanoes (also called shields)
•
Cinder Cones
•
Spatter Cones
•
Complex Volcanoes (also called compound)
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Ready to get your trophy?
Volcanoes are a mountain which accumulated by
1.
Folding and crumpling.
2.
Uplift and Erosion.
3.
Accumulation of their own eruptive products
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Great!
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Let’s try again!
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Click the right answer
The types of volcanoes are
Composite Volcanoes
Earth quake
Shield Volcanoes
Cinder Cones
Hurricane
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Please try again!
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Positive Products from Volcanoes
◦ Geothermal Energy
Volcanic ash
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Ash blows over land
and increases soil
fertility for forests
and agriculture by
adding nutrients and
acting as a mulch.
Groundwater heated
by large, still hot
magma bodies can
be tapped for
geothermal energy.
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Positive Products from Volcanoes
are
Geothermal Energy
Power point
An earthquake
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Earthquake
Please watch this vedio !
http://www.schooltube.com/search/?term=EART
HQUAKE
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An Earthquake
A trembling or shaking of the ground
caused by the sudden release of energy
stored in the rocks below the surface,
radiating from a fault along which
movement has just taken place.
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Measuring an Earthquake
The Richter scale 1-10
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Facts about Earthquakes
Earthquakes can occur at any time of the
year and at any time of the day or night.
Earthquakes occur under all weather
conditions, sunny, wet, hot, or cold--without
special tendency.
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Trophy time!
What is an earthquake?
A land form where molten rock erupts through the surface of
the planet.
Shaking of the ground caused by the sudden release of
energy stored in the rocks below the surface.
A vast tropical storm that has winds
whipping around.
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You Did
Great!
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Sorry, a land form where
molten rock erupts through
the surface of the planet is a
volcano..
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Sorry, a vast tropical
storm that has winds
whipping around is a
hurricane.
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Myths about Earthquakes
The ground does not open up and swallow people
(a commonly feared myth). Open ground cracks
may form during an earthquake--related, for
example, to land sliding or ground slumping. But
such fissures are open gaps (they don't "swallow")
that a person could stand in.
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Trophy Time
What scale is used to measure an earthquake?
Pedometer
Richter scale
Mechanical scale
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Lets' try again.
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Wrap Up
Good job!
Review: earthquakes and volcanoes are natural
disasters.
A volcano is a land form where molten rock erupts through the surface
of the planet. Gases and rock shoot up through and spill over with lava
fragments.
Earthquakes and volcanoes occur in the Ring of Fire.
Back
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The Resources.
1http://vulcan.wr.usgs.gov/LivingWith/VolcanicFacts/misc_volcanic_fa
cts_questions.html
2- http://www.seis.utah.edu/qfacts/genfaq.shtml
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