It is also known as physical weathering. The disintegration of rocks without any change in their chemical composition is known as mechanical weathering. Moisture, changes in temperature, frost action, and winds are the main actors of mechanical weathering. This kind of weathering usually occurs in hot deserts because of the wide ranges of temperature. There are four types of mechanical weathering:
Types of Mechanical Weathering
Block Disintegration: Rocks disintegrate because of repeated expansion (due to high temperature) and contraction (due to extremely low temperature).
Granular Disintegration: Agents of weathering reduce the rocks made of different minerals to small pieces and fragments.
Exfoliation: Sudden change in temperature may cause cracks and fissures in rocks. Weathering occurs when water percolates in these fissures. The sudden expansion and contraction of rocks result in the peeling of their outer layers or exfoliation.
Frost Action: In regions of a dry climate, the cracks in rocks get filled with water. During the night, the water freezes and expands. When this process is repeated several times, the rock eventually breaks.
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