Q: Fact 1: Mechanical weathering is when rocks are broken down by mechanical means. Fact 2: Ice wedging is the most important form of mechanical weathering. Given the two facts above, what can break down rocks?

OPTIONS:
A). Jellyfish.
B). sea urchins.
C). deltas.
D). erosion.
E). ice wedging.
F). room temperature.
G). clouds.
H). cliffs.
The answer is:
E).