Weathering,Erosion and Transport of Rock material
Weathering can be considered as the breakdown of rock to form sediment. It is also regarded as the physical breakdown (disintegration) and chemical alteration (decomposition) of rocks and minerals at or near the earth’s surface.The three main types of weathering are physical weathering, mechanical weathering, and chemical weathering. Mechanical weathering is the physical breakdown of rocks and minerals into smaller pieces that retain the chemical composition of the parent material. (Body from which the weathered material originated.) Once again, under mechanical weathering, there are other processes that take place such as: Frost action simply involves water creeping in rock crevices and freezing. Where the ice formed expands, it wedges itself into these crevices. This is known as Frost wedging. E.g. Talus slope, Lost River, West Virginia, USA. When ice thaws, it causes parts of the rock to be dislodged from the main body. Thermal expansion and contraction are to do with the volume of the minerals in rocks changing (expanding and contracting) in response to cooling and heating. Another important factor h
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Approximate Word count = 945
Approximate Pages = 4 (250 words per page double spaced)
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