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      Question

      Which weathering agent is biological in nature ?

      A Freeze-thaw cycles Correct Answer Incorrect Answer
      B Root penetration Correct Answer Incorrect Answer
      C Hydrolysis Correct Answer Incorrect Answer
      D Oxidation Correct Answer Incorrect Answer
      E Carbonation Correct Answer Incorrect Answer

      Solution

      Biological weathering includes root action. Freeze-thaw is physical; hydrolysis/oxidation are chemical.

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