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  • The geographical process by which rock and minerals are broken down. Weathering occurs when rocks and minerals are exposed to atmospheric agents such as wind and water; however, this is not the same as erosion, which occurs when land is transported or worn away by wind or water, usually after weathering. There are two types of weathering: chemical and mechanical. Chemical weathering occurs when the chemical compo sition of rock/mineral is transformed by the chemical elements of an atmospheric agent. Mechanical weathering, on the other hand, is the physical process by which rocks/minerals are broken down into smaller pieces. Mechanical weathering changes the physical nature of the rock/mineral but does not affect the chemical composition.


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