External forces

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17 Terms

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Erosion
________ wears away Earths surface (wind, glaciers, moving water)
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Drawbacks
________: Good soil can be carried away, leaving the land barren.
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Chemical
________- changes the actual chemical make- up of the rock.
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soil rock
Fast- moving water →cuts into land and wears away ________ → creates sediment which grinds away other rocks.
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Physical
breaks the rock into smaller pieces
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-Ex
Water freezes in the crack, ice splits the rock, Broken tombstone
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Chemical
changes the actual chemical make-up of the rock
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-Ex
Water + CO2 destruction of limestone; Mammoth Cave (carbonic acid)
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-Ex
Bronze turning green when exposed to elements
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-Ex
Bryce Canyon (with a little water erosion)
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Benefits
Mineral-rich soil is deposited, creating fertile soil
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Drawbacks
Good soil can be carried away, leaving the land barren
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-Ex
Glacier National Park, Grand Tetons
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-Ex
Great Lakes
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Sheet
flat, broad sheets of ice (Greenland, Antarctica)
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Mtn
found in high mtns
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-Ex
Grand Canyon and Colorado River