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State four ways in which biological agents may enhance soil formation.

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  1. burrowing animals eg mules dig out the soil causing mechanical break up of small rock fragments from the main rock.
  2. decomposition of organic matter brought about by micro-organisms.
  3. root penetration into cracks in a rock causes its diantegration.
  4. large animals trample over surfaces of rocks with their hooves breaking away small rocks particles
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