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    ESS
    Grade-7
    Easy

    Question

    Assertion (A): The freeze/thaw action of water in open spaces in rock is the most important single agent of physical weathering.
    Reason (R): Understanding the force of frost shattering requires repetition.

    1. Both (A) and (R) are true, and (R) is the correct explanation for (A)
    2. Both (A) and (R) are true, but (R) is not a correct explanation for (A)
    3. (A) is true, but (R) is false
    4. (A) is false, but (R) is true

    hintHint:

    The freeze-thaw is a type of mechanical weathering. There are various environmental factors that cause mechanical weathering.

    The correct answer is: (A) is false, but (R) is true

      • The freeze-thaw weathering occurs by the passage of water in the pores of porous rocks.
      • It is a type of mechanical weathering, but not the only type of mechanical weathering.
      • The understanding of frost force needs repetition.

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