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Name: Gary R Henry
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What is acid rain?

If you have ever seen a smoke stack on a cold day then you know that junk pours out of them and into the atmosphere. While it is up in the air, the waste gasses sulphur-dioxide and nitric-oxides react with water vapor to create sulfuric acid and nitric acid. When it rains, these acid droplets come back to earth. The acid can be harmful to plants and to buildings made out of limestone, so Congress passed the Clean Air Act to try to cut back on the amount of air pollution that causes acid rain. You may read the other messages in the ask-a-scientist archive of old questions to learn more about acid rain and its effect on the environment.


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