Weathering is defined as the disintegration of rocks and minerals at or near the surface of the Earth. Mechanical, or physical, weathering occurs when temperature or pressure changes cause rocks to deteriorate into smaller fragments that retain the properties of the original material. Chemical weathering, on the other hand, is caused by the presence of chemical agents. It can lead to either addition or removal of materials, and in the process, the chemical composition of the original mineral is permanently altered.
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