Which of the following is an example of chemical weathering?

Which of the following is an example of chemical weathering?

a. Frost wedging

b. Heat expansion

c. Acid rain

d. Salt wedging

 

C: Acid rain is an example of chemical weathering. When acidic chemicals are evaporated and fall as rain, they can have devastating effects on plant and animal life. Although human activity is the primary cause of acid rain, weathering chemicals can also get into the atmosphere through oceanic bacteria and volcanoes.

The other three answer choices are examples of mechanical weathering. Frost wedging occurs when water seeps into a narrow space within a rock formation and then freezes. Because water takes up more space as ice and frost than it does in its liquid state, this process can cause structural damage to the rock.

Heat expansion occurs when rapid changes in temperature cause rocks to expand, leading to cracks and fissures. Salt wedging occurs when water flowing into a rock brings salt in with it. The water evaporates, but the salt is left behind, and over time the deposits of salt can create pressure within the rock.

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