Lecture 10 Feb 11-2008 Weathering and Erosion

Lecture 10 Feb 11-2008 Weathering and Erosion - The rock...

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The rock cycle is a set of geologic processes relating the formation of the three rock types. [Processes in red. Rocks in black.]
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Weathering = the destructive processes by which rocks are changed on exposure to “the weather.” Erosion = the physical disintegration that turns rock into sediments that can be transported away by moving water, ice, and wind. Vacationing geologist with children
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The most important agents of weathering are water and carbon dioxide. The factors controlling the rate of weathering are temperature and amount of rainfall. Different rocks weather at different rates.
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Physical (mechanical) weathering takes place when solid rock becomes fragmented by physical processes that do not change its chemical composition. Vacationing geologist with children
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Joints (regularly spaced fractures) in the rock formed at the time a magma cooled and crystallized offer pathways for water to enter. The cracks can be widened by frost wedging – the breakage of rock resulting from the expansion of freezing water.
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accumulation that forms at the base of a cliff over long periods of time. Talus slopes offer many
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This note was uploaded on 04/11/2008 for the course EVSC 280 taught by Professor Herman during the Spring '08 term at UVA.

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Lecture 10 Feb 11-2008 Weathering and Erosion - The rock...

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