5th Grade Ch. 9 Lesson 4 What is Erosion
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Transcript of 5th Grade Ch. 9 Lesson 4 What is Erosion
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Ch. 9 Lesson 4What is erosion?
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erosion• movement of materials from 1 place
• destructive process
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landslides• gravity quickly pulls rocks &
dirt downhill
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landslide
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deposition• placing of the materials in a new place
• constructive process
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delta• place where heavy sediments are
deposited when a river meets an ocean
Mississippi River
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The Mississippi Delta includes much of coastal Louisiana and Mississippi, including
the metropolitan area of New Orleans.
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delta
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rocks are ground into sediment under moving glaciers
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Rivers can make deep canyons by erosion.
Grand Canyon
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• waves, sand & gravel break rocks• form harbors & inlets- erode more
quickly than other areas• harbors= areas that are protected
from ocean waves
wave erosion
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sand erosionsand erosion
•wind blows dust, soil or sand from 1 place to another
•makes sand dunes
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wind erosion• winds blow topsoil from fields
• farmers surround fields with tall trees
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