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1.) List a few of the gases which lead to acid rain.
sulfur dioxide and nitrogen oxides

2.) What is the source of much of the acid rain producing gases in Pennsylvania?
30 percent of the nitrogen oxides causing acid rain come from production. Automobiles give 30 percent and the agricultural sector contributes an additional 25 to 30 percent.

3.) Briefly explain how acid rain forms.
Acid rain forms when sulfur dioxide and nitrogen oxides in the atmosphere combine with water to form sulfuric acid and nitric acid. These acids, mixed with rainwater, fall as acid rain.