chapter_05_lec modified

chapter_05_lec modified - Weathering and Soil Physical...

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Steve Kadel, Glendale Community College Weathering and Soil Physical Geology 11/e, Chapter 5
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Weathering, Erosion, and Transportation Rocks exposed at Earth’s surface are constantly changed by water, air, temperature variations and other factors Weathering is the group of destructive processes that change the physical and chemical character of rocks at or near Earth’s surface Erosion is the physical picking up of rock and mineral particles by water, ice, or wind Transportation is the movement of eroded particles by water, ice, wind, or gravity
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Weathering and Earth Systems Solar system Earth-style weathering (water, ice, wind) is nearly unique to our planet, at present. Small amounts of weathering (primarily by wind) still occur on Mars, and water erosion appears to have been important there in the distant past. Atmosphere Oxygen and carbon dioxide are critical to chemical weathering Water cycled through atmosphere is critical to chemical and mechanical weathering processes Chemical weathering also removes carbon dioxide from the atmosphere, helping to keep global temperatures from soaring
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Weathering and Earth Systems Hydrosphere Water is necessary for chemical weathering Oxygen dissolved in water oxidizes iron in rocks Carbon dioxide dissolved in water creates carbonic acid
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chapter_05_lec modified - Weathering and Soil Physical...

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