weathering - Weathering and Erosion...

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Tim Davis/Photo Researchers Weathering and Erosion Weathering and Erosion
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W. W. Norton
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Weathering Physical and chemical changes in rocks exposed to atmosphere and biosphere.
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Physical Weathering Physical Weathering Disintegration of rocks without chemical change. Example: Frost/Ice Wedging - water enters cracks and expands when it freezes; rock is pried open
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Physical Weathering Increases Surface Area Physical Weathering Increases Surface Area
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Fig. 7.06a W. W. Norton Frost or Ice Wedging Frost or Ice Wedging
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Fig. 7.05c Stephen Marshak Talus slope - pile of rock at base of slope from frost wedging
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Fig. 7.04 Pressure Release or Unloading Granite pluton Downward pressure
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Chemical Weathering Chemical Weathering Minerals formed deep in Earth’s interior unstable at surface; altered or destroyed by water and air. Stability - a mineral’s resistance to weathering; e.g. more stable; harder to weather.
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weathering - Weathering and Erosion...

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