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Describe two causes of biological weathering.

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  1. Action by plants
    • Roots of plants penetrate grow into joints or cracks.
    • As the trees grow bigger, the root also grow bigger widening the joints and cracks.
    • Blocks separate in what is called wedging mechanism. 
  2. Action of animals
    • Burrowing animals such as moley rabbits, Earth worms break off small bits of rocks from the main rock.
    • By digging these animals expose a large surface area to other weathered processes.
    • Large herds of cattle and Zebras’ bound the rock with there hooves as they move breaking them into smaller particles. 
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