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weathering

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

weathering The breakdown of rocks and minerals at and below the Earth's surface by the action of physical and chemical processes. Essentially it is the response of Earth materials to the low pressures, low temperatures, and presence of air and water that characterize the near-surface environment, but which were not typical of the environment of formation. There are several varieties of rock breakdown (see also MECHANICAL WEATHERING). Simple disintegration may occur, resulting in the production of coarse, angular blocks, of peels or skins (the process of ‘desquamation’), of sands, and of silts. Minerals may be removed in solution, and chemical weathering may form new, often easily eroded substances. See also CARBONATION; EROSION; FROST WEDGING; HYDRATION; HYDROLYSIS; and THERMOCLASTIS.

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