Verified Answer :

plantlover65

-The water washes it causing it to break
-How hot or cold it is matters.
-ice can get into cracks which causes it to crack
-????

Jas131

Rain wears it down, water seeps into cracks and turns to ice; creating bigger cracks, it can expand and contract due to temperatures rising and lowering and plants can grow on it so the roots break down the rocks to make room