The most common type of mechanical weathering occurs when

a.
acidic water seeps into a crack in a rock.
b.
seeds take root in a crack in a rock.
c.
water freezes in a crack in a rock.
d.
rocks collide during subduction.

The correct answer is c. water freezes in a crack in a rock.

The water freezes which makes its volume greater so it breaks the rock so then the water thaws and then new water comes, even more of it, so it freezes, and so on and so forth until the rock breaks completely.

Yes, it’s awesome
: )