How does water cause frost wedging? A
Water attracts lightning, which breaks apart huge boulders into many smaller pieces.

B
Water carries sediment to large rocks, causing them to rub against each other.

C
Water freezes and thaws inside rock cracks, causing them to widen and then split.

D
Water slowly wears down a rock’s sharp edges, leaving behind a smooth surface.

C. Water freezes and thaws inside rock cracks, causing them to widen and then split.

Explanation:

When water gets in the crack at the bottom and freezes, frost wedging occurs.

Frost wedging happens when water gets in crack, freezes, and expands. This process breaks rocks apart. When this process is repeated, cracks in rocks get bigger and bigger (see diagram below) and may fracture, or break, the rock.

synapse nervous system