geo - weathering

geo - weathering - Weathering: at or near Earths surface...

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Weathering: at or near Earth’s surface physical breakdown, chemical alteration of rock 2 types: - mechanical - chemical Mass Wasting: transfer of soil and rock downslope with gravity’s help Erosion: physical removal of materials by mobile agents (water, wind, ice, gravity) MECHANICAL WEATHERING: Frost Wedging: alternate freezing and thawing of water in cracks and fractures promotes: - disintegration of rocks Unloading, Sheeting, Exfoliation: at Earth’s surface caused by: - reduction in confining pressure Thermal Expansion: alternate expansion and contraction due to: heating and cooling Biological Activity: disintegration resulting from plants and animals
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CHEMICAL WEATHERING breaks down: - rock components - internal structures of minerals most important agent = - slightly acidic water Major Processes: dissolution oxidation hydrolysis Dissolution: helped by small amounts of acid in water
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geo - weathering - Weathering: at or near Earths surface...

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