Assertion: rain's chemical | /r/CapableOf | form acidic compounds
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text: Acid rain, according to the Environmental Protection Agency, is what you get when chemical emissions from man-made and natural sources (primarily sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ) from fossil fuel combustion) go up into the atmosphere and react with water, oxygen, and other chemicals to form acidic compounds and then come back town as acidic rain, snow, sleet, or fog.