Transcript Earth Changes

Earth Changes
Chapter 5 Lesson 3
Vocabulary
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Earthquake
Volcano
Flood
Landslide
How does Earth Change?
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Earth can change over a long time or
a very short time.
Earth is always changing.
New mountains, lakes and rivers are
forming.
Old ones are disappearing.
How does Earth Change?
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What can cause changes to Earth?
What do you think caused these
changes?
Earth Changes Slowly
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Water, wind, and ice slowly change
the shape of land and rocks.
Erosion and weathering cause slow
changes.
Weathering is when rocks or land are
broken into small pieces.
Erosion is when wind or water move
the smaller pieces.
Wind Changes
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Wind can shape land
over a long period of
time.
Think of a mountain.
The wind will slowly
move the dirt and
rocks.
The mountain will
become shorter and
shorter until it is flat.
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Mountain wind erosion
http://www.youtube.com/watch?v=V
aciwgKBeb8
Water Changes
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Water can be very
powerful.
Fast moving water
can carve through
rock and land.
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Beach Erosion
http://www.youtube.com/watch?v=L
N_0LM1XtbU
Alaska Coast erosion
http://www.youtube.com/watch?v=U
6-MBcrUoTA
Ice Changes
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Ice can change land too.
Ice can slowly split open rocks.
If water freezes, it becomes ice.
The ice pushes the crack open.
How does Earth Change Quickly?
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Changes on Earth’s crust or surface
can happen quickly.
These include earthquakes,
volcanoes, floods, and landslides.
Earthquakes
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Earthquakes
happen when the
Earth’s crust shakes
or moves.
Earthquakes can
cause damage to
buildings or land.
They can also form
mountains.
Volcanoes
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A volcano is an
opening in Earth’s
mantle and crust.
When volcanoes erupt,
a hot liquid comes out.
The hot liquid destroys
plants and animals.
When the liquid cools,
it makes new land
shapes.
Floods
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A flood is water that
flows over land and
cannot easily soak
into the ground.
Floods make it hard
for animals and
plants to survive.
Soil would wash
away and mud would
cover the ground.
Landslides
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A landslide is sudden movement of
soil from higher to lower ground.
Rain or melting snow causes
landslides.
Questions
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How does water change Earth?
How will Earth’s surface change after
a flood?
What is strong enough to change a
rock?