Which of the following is an example of mechanical weathering?
a. gravity
b. oxidation
c. acid formation
d. lava intrusion

Mechanical weathering, also called physical weathering, causes rocks to crumble. Water seeps into cracks and crevices in rock. If the temperature drops low enough, the water will freeze. When water freezes, it expands.

d. i., ii., iii., and iv.

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