erosion and deposition cynthia
TRANSCRIPT
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Actions That Change Earth’s Surface
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• The physical or chemical processes that break down (wear away) rocks
• Agents of weathering: wind, water, ice, gravity, plants and animals (biologic)
• Mechanical weathering: ice wedging, root pry, abrasion (grinding), exfoliation, animals, and thermal expansion
• Chemical weathering: oxidation (iron + oxygen + water = rust), acidic precipitation (from burning fossil fuels: sulfur, carbon dioxide, and nitrogen), plant acids (lichens and mosses) carbonic acids (marble and limestone), hydrolysis (feldsapar to clay), and dissolution (water)
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The type of rock: mineral compositionSurface area: smaller rocks have a greater
surface area (consider volume) and weather faster
Climate (temperature and precipitation): hot/warm and wet/humid weather fastest
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Erosion is the transport (movement) of weathered rocks and sediment from one place to another.
Erosion is usually gradual…
Humans can speed it up.
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WindWaterWavesGlaciers (ice)Gravity (mass
movement, mass wasting)
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What goes up must come down.
What is carried must be… dropped.
Deposition occurs when agents of erosion deposit (lay down, drop) sediment.
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Sand bars Longshore drift
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Large mass of moving ice and snow
Plucking Abrasion
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Rapid Mass Wasting…
Landslide Mudflow
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Creep SlumpSlow mass wasting…
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Deflation Sand dunes
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Poor soil conservation…
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Running waterLoad deposits
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Delta Alluvial fan
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Stalactites and stalagmites