Which of the following is a result of a change in pressure?
a. frost wedging
b. chemical feathering
c. oxidation
d. exfoliation

Frost wedging among the following choices given in the question is as a result of a change in pressure. The correct option among all the options given in the question is the first option or option "A". When the cracks of rock layers containing water freezes during the night, this causes the pressure within the cracks to increase causing frost wedging.

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.