Question

What is likely to cause cracks on the sidewalk?

a) Repeated freezing and thawing of water
b) Tree roots or plant roots growing bigger
c) Both and A and B
d) Neither A nor B

Answer 1

Answer:-

The cool nights and hot days always cause things to expand and contract. That movement can cause rocks to crack and break apart. Roots and plants also push into the rocks and break them apart. They act like wedges and push the rocks apart. Little animals also help by burrowing and digging through the ground.

Scientists have observed a process called freeze-thaw.

Explanation:

C) Both A and B

Hope you understand