Acid rain is caused when certain chemicals are released into the atmosphere, chemically react, and fall as rain or snow. Acid rain has a pH that is much lower than normal rainwater. pH measures if a substance is an acid or a base.

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Acid Rain Formation
[ Kids/Teens ] Has a picture that shows how acid rain forms, and why it's bad.
Wikipedia: Acid Rain
[ Mature Teens ] The history of acid rain, why it occurs, and how it can be prevented.

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