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Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
MCQ
Sun causes weathering of rocks through:
  • A
    Mechanical force.
  • ✓
    Physical phenomena.
  • C
    Chemical changes.
  • D
    Biological changes.
✓

Answer

Correct option: B.
Physical phenomena.
Sun’s energy heats up rocks to a high temperature which causes them to expand. When temperature falls, these rock contract. This continuous expansion and contraction causes the rock layer to wear off. And hence results in weathering of rocks.

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