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

b. Acid rain falling on sidewalks

Explanation:

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Acid rain contains majorly carbonic acid which could react with the concrete that is used to make sidewalks. This chemical reaction, although varies based on the concrete's composition, usually gives off carbon dioxide owing to the acid's instability and leads to the weathering since the sidewalks start to wear out and subsequently break down.

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a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

if you're asking what comes out, it's steam.