Transcript Weathering and Erosion

Weathering
and
Erosion
Destructive Forces
Destructive forces are processes that
destroy landforms.
 Can you think of a natural disaster that
can quickly destroy landforms?
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Landslides
Volcanic Eruptions
Earthquakes
Floods
Weathering and Erosion
Weathering and erosion are natural
processes that can affect Earth’s oceans
and land.
 However, these processes happen over
time.
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Weathering
Weathering is a process that breaks down
rocks at or near the surface of the Earth.
 These processes cause the surface of the
earth to dissolve, decompose, and break
in to smaller pieces.
 Can you think of some types of weather
that could cause rock to break down?
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Water
Plants growing in rock
Changes in temperature can break rock
Wind that blows sand or other particles
What type of weathering caused
this in the Grand Canyon?
Here is another example from the
Grand Canyon.
Erosion
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Erosion is the movement of sediments
(sand and silt) and soil by wind, water, ice,
and gravity.
What is carrying the dirt away?
Constructive Forces
Constructive forces are processes that
create landforms.
 Can you think of examples or acts of
nature that would quickly create
landforms?
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• Landslides
• Volcanic Eruptions
• Floods
• Even though these are destructive, they
can also be constructive.
Deposition
Deposition is the dropping, or depositing,
of sediments by water, wind, or ice.
 Over time, deposition builds up new land
on Earth’s surface.
 Can you think of examples of deposition?
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Seashells washed onto the beach
A delta is an example of deposition.
Think ‘Wedding’ – These processes
work together to create new land.
When trying to remember these terms,
remember WED.
W = Weathering
This breaks down the rocks.
E = Erosion
Erosion carries away the rock and sediment.
D = Deposition
Deposition is where the sediment and soil
are
dropped off and create new landforms.
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