List and discuss briefly, the agents of biological and physical weathering processes

Agents of biological process of weathering
1. Roots of plants
2. Hooves of animals
3. Earthworm
4. Man

Root of plants: these penetrate the rock resulting in breaking of rocks
Hooves of animals:  trample on rocks and break them
Earthworm: the burrowing activities of earthworm allow water, carbon dioxide, etc. to enter and react with rock.
Man: the activities of man during cultivation help to break rocks
Agents of physical process of weathering
1. Water
2. Wind
3. Temperature
4. Pressure
Water: water react with rock or break rock during erosion
Wind: wind blows rocks against rocks resulting in breakage
Temperature: expansion and contraction of rocks due to temperature causes disintegration of rocks
Pressure: the weight of over laying rocks causes rocks to fall and these results in breakage.

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