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the natural disintegration and decomposition of rock in response to physical and chemical processes operating at, or near the earths surface
-rocks are either stationary or moving |
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| the picking up or physical removal of weathered and/or unweathered rock particles by an agent such as streams or glaciers |
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| the movement of eroded particles by agents such as rivers, glaciers, etc. weathering processes may continue during this |
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| the physical disintegration of rock into smaller pieces |
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| the decomposition of rock resulting from its exposure to water and atmospheric gases |
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-as water freezes it expands by about 9%
-if water is trapped in cracks in a rock then it will expand or freeze, exerting pressure on the rock walls similar to the produced by driving a wedge into the crack |
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| the reduction of pressure on a body of rock can cause it to crack as it expands |
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| the stripping of concentric rock slabs from the outer surface of a rock mass |
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| a large discordant pluton with an outcropping area greater than 100 km |
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| a fracture or crack in a rock along which essentially no displacement has occured |
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| the grinding away of rock by friction and impact during transportation |
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| the mineral passes directly into solution, like salt in water |
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| oxygen O2- ions from the atmosphere combine with a mineral to produce a new oxide mineral |
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| hydrogen or H+ ions from water combine with a mineral, thereby producing a new mineral |
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| most effective agent of chemical weathering |
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| varying rates of weathering result from some rocks in an area being more resistant to weathering than others |
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| factors that influence weathering |
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| rock type, climate, slope, time |
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