2. what changes take place during physical weathering?

a. rocks are broken into smaller pieces.

b. the mineralogy of previously existing rocks changes.

c. minerals crystallize as water evaporates.

d. all of these changes take place.

The correct answer is A. Rocks are broken into smaller pieces.

Explanation:

In geography, the term weathering is used to refer to the process in which rocks and others such as soil or mineral break into smaller pieces. This can occur due to chemical agents or due to physical factors. Physical weathering includes factors such as temperature, physical contact or pressure that make rocks and other materials break in smaller pieces without changing the general properties or composition of the material. Additionally, these pieces along with other materials form the soil. According to this, the change that takes place during physical weathering is "Rocks are broken into smaller pieces".