Physical and Chemical Weathering.

... Physical and Chemical Weathering Weathering is defined as "the break down or alteration of rock in its natural or original position at or near the Earth's surface through physical, chemical, and biological processes induced or modified by wind, water, and climate." During the weathering process, the movement of disintegrated or altered rock occurs in the immediate vicinity of the rock, but the rock mass remains in its original place and does not move. Weathering is different from erosion, which usually includes the transportation of the disintegrated rock and soil away from the site. Physical, or mechanical, weathering processes lead to the break-up of the rock without any change in the minerals that form the rock. It usually produces sands and other fine rocks, and there are many types, including frost shattering, salt crystallization, pressure release, thermal expansion, and biological weathering which tends to come under the heading of physical. Frost shattering, sometimes aptly

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