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5. Biological Weathering Biological weathering occurs when living organisms contribute to the breakdown of rocks. The main biological agents are: Plants Animals Microorganisms Plant Roots Plant roots grow into small cracks in rocks. As roots grow thicker, they exert pressure and break the r…

5. Biological Weathering Biological weathering occurs when living organisms contribute to the breakdown of rocks. The main biological agents are: Plants Animals Microorganisms Plant Roots Plant roots grow into small cracks in rocks. As roots grow thicker, they exert pressure and break the rock. Roots also release organic acids, which chemically weather minerals. Animals and Humans Burrowing animals such as earthworms, termites, and rodents disturb the soil and rock fragments. Human a