Which of the following is an example of chemical weathering?
a. waves washing over rocks on the beach
b. acid rain falling on sidewalks
c. ice forming in the cracks of rocks
d. wind blowing against rocks

The correct answer is - b. acid rain falling on sidewalks.

The acid rain and its corrosive power are a perfect example of a chemical erosion. Mainly, when we think of erosion, we are thinking about erosion in the natural environment, but it occurs everywhere, and the example with the sidewalk is a great example. If there's acid rains more often, little by little, they will start eroding the material from which the sidewalks are made, thus creating cracks, holes, and uneven surfaces on it. The acid rains have a very big corrosive power, and this is due to their composition in which there can be all sorts of toxic and corrosive substances, thus causing a chemical erosion on the affected places by it.