Question

Which of the following illustrates mechanical weathering

1

Carbonic acid wearhers marble and limestone

2

As plants grow they produce weak acids that slowly dissolve rock

3

Ocidation causes weathering in rock

4

Reapeated freezing and thawing in rocks causes weathering

Answer 1

The answer is #4. The first and second one involve acid, which is chemical weathering. The third one involves oxidation, which is a chemical process. The only mechanical process is option four.