acid rain

Rain containing higher than normal amounts of nitric and sulfuric acids. Acid rain formation results from both natural sources, such as volcanoes and decaying vegetation, and man-made sources, primarily emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) resulting from fossil fuel combustion.

Citation: 
Adapted from "What Is Acid Rain?" US Environmental Protection Agency. Web. 24 Nov. 2015. <http://www3.epa.gov/acidrain/what/>.
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