Olsen,+S.

There are 3 types of weathering: 1. Mechanical Weathering, which produces clasts of rock/mineral which are smaller than the original, and of the same general composition. 2. Chemical weathering which produces smaller pieces, but of a different chemical composition 3. Biological weathering, which isn't a type of its own, the actions of plants and animals can and do lead to both mechanical and biological weathering.

( Mechanical Weathering ) ( Chemical Weathering ) ( Biological Weatherig )