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Which of the following statements describes the difference between physical and chemical weathering?

A. Physical weathering affects rocks, while chemical weathering affects only minerals.

B. Physical weathering is caused by ice, while chemical weathering is caused only by water.

C. Chemical weathering changes the composition of a rock, while physical weathering does not.

D. Chemical weathering affects all kinds of rocks, while physical weathering does not.

Chemical weathering changes the composition of a rock, while physical weathering does not.

Explanation:

Chemical weathering of rocks is a chemical reaction. A chemical change is known to change the composition of a substance. Once a substance is subjected to a chemical reaction, a new substance is automatically formed thereby changing the composition of the original substance.

A physical weathering agent does not affect the composition of rocks. This a major difference between chemical and physical weathering processes. For instance, physical weathering caused by ice has nothing to do with internal rock composition.

B. Physical weathering is caused by ice, while chemical weathering is caused only by water.