The primary process in physical weathering is (the process by which clasts and other particles are reduced in size). However, chemical and physical weathering often go hand in hand. For example, cracks exploited by physical weathering will increase the surface area exposed to chemical action. Furthermore, the chemical action at minerals in cracks can aid the disintegration process.
Thermal stress weathering is an important mechanism in where there is a large temperature range, hot in the day and cold at night. The repeated heating and cooling exerts on the outer layers of rocks, which can cause their outer layers to peel off in thin sheets. Although temperature changes are the principal driver, moisture can enhance in rock. and range fires are also known to cause significant weathering of and boulders exposed along the ground surface. Intense, localized heat can rapidly expand a boulder.
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