1.) List a few of the gases which lead to acid rain.
Acid rain is caused by sulfur dioxide and nitrogen oxides which are produced when fuels burn.



2.) What is the source of much of the acid rain producing gases in Pennsylvania?
The source of most sulfur dioxide is high-sulfur coal burned in power plants.


30 percent of the nitrogen oxides comes from power production. Automobiles generate another 30 percent, and  an additional 25 to 30 percent is caused agriculturally.



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. With these acids that are mixed with rainwater, fall to Earth as acid rain, snow or fog and can acidify lakes and streams in the Northeast.