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Weathering and Erosion
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Weathering The breakdown of the materials of Earth’s crust into smaller pieces.
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The Agents of Weathering
Ice Plant roots Friction and impact Burrowing of animals Temperature changes Water Oxygen Carbon dioxide Living organisms Acid rain
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Frost Wedging (Ice)
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Plant Roots
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Burrowing of Animals
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Temperature Changes
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Water Water weathers rock by dissolving it
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Oxygen Iron combines with oxygen in the presence of water in a processes called oxidation The product of oxidation is rust
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Carbon Dioxide CO2 dissolves in rain water and creates carbonic acid
Carbonic acid easily weathers limestone and marble
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Living Organisms Lichens that grow on rocks produce weak acids that chemically weather rock
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Acid Rain Compounds from burning coal, oil and gas react chemically with water forming acids. Acid rain causes very rapid chemical weathering
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Erosion The process by which water, ice, wind or gravity moves fragments of rock and soil.
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Water Erosion Rivers, streams, and runoff
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Ice Erosion Glaciers
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Wind Erosion
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