Mechanical weathering a. breaks apart rock by physical processes b. occurs when chemical reactions dissolve or change the minerals in rocks c. occurs when the iron is exposed to oxygen and water d. none of the above

the answer is option A.

Explanation:

Mechanical weathering is additionally alluded to as Physical Weathering.  It occurs because of different changes in the earth like temperature changes, water or rain on the stones makes splits that breaks them. Mechanical weathering is the way toward breaking enormous rocks into minimal ones. This procedure as a rule occurs close to the surface of the planet. Temperature likewise influences the land. The cool evenings and hot days dependably purpose things to extend and contract. That development can make rocks split and break separated.

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.