Weathering 101 - basic introduction

Weathering: The disintegration and decomposition of rock in situ (in their place of origin). There are two types of weathering: Mechanical (Physical) or Chemical

Physical Weathering: The disintegration of rocks into smaller pieces caused by physical processes without any change to the chemical compound of the rock. It occurs on bare rock that lacks vegetation. Physical weathering usually produces sand.

Chemical Weathering: The decomposition of rock caused by a chemical change in the rock. It produces changed substances and soluble, and usually forms clay. It is more likely to occur in areas in warm moist climates where there is associated vegetation on rocks.