Acid rain
precipitation, as rain, snow, or sleet, containing relatively high concentrations of acid-forming chemicals, as the pollutants from coal smoke, chemical manufacturing, and smelting, that have been released into the atmosphere and combined with water vapor: harmful to the environment.
noun
rain that contains a high concentration of pollutants, chiefly sulphur dioxide and nitrogen oxide, released into the atmosphere by the burning of fossil fuels such as coal or oil
A type of precipitation made up of dilute acids, primarily a by-product of heavy industry.
Note: Acid rain is a result of the combination of water with chemicals released into the atmosphere by the burning of fossil fuels.
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