Question

Which is an example of mechanical weathering?

A. Carbonic acid reacting with minerals in a rock
B. An iron-containing rock becoming rusty at its surface
C. Small rocks and pebbles falling down a slope
D. Plant roots splitting a rock apart as they grow

Answer 1

D. Plant roots splitting a rock apart as they grow

Step-by-step explanation:

In mechanical weathering, rocks break apart without a change to their mineral composition. Biological activity, such as the growth of plant roots, is one of the main causes of mechanical weathering.

Answer 2

D

Step-by-step explanation:

mechanical weathering is the breaking down of a larger rock into smaller ones. A and B are chemical weathering and C is irrelevant.