Multiple choice

What is an agent of mechanical weathering?

  1. carbon dioxide

  2. acid rain

  3. oxygen

  4. freezing and thawing
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Freezing and thawing (frost wedging) physically breaks rocks apart without changing their chemical composition, making it a mechanical weathering agent. Carbon dioxide, acid rain, and oxygen cause chemical weathering by reacting with minerals in the rock.

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