Any form of precipitationThe formation of a solid within a solution, often by the combination of cations and anions to form an insoluble ionic compound. from the atmosphereA unit of pressure equal to 101.325 kPa or 760 mmHg; abbreviated atm. Also, the mixture of gases surrounding the earth. (rain, snow, frost, etc.) that produces water with a pH below 5.6. Usually the acidity comes from sulfur and nitrogen oxides formed by combustionVigorous combination of a material with oxygen gas, usually resulting in a flame. of fossil fuels.
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