On the basis of their causative factors, Biological Weathering is classified as follows:
1. Weathering by Vegetation: Roots of different types of trees by entering into the rocks make their particles loose, due to which dis – integration in the rocks takes place. This is called weathering by vegetation.
2. Weathering by Living Organisms: This weathering takes place when the rocks are disorganized by various living – organisms like earthworm, termite, rats and animals.
3. Weathering by Humans: When the rocks are disorganized by various human activities like mining, agriculture, construction, atomic explosion, it is included in the weathering by humans.