Acid rain begins to form when pollutants like sulfur dioxide and nitrogen oxides are emitted into the atmosphere. These pollutants get oxidized when they are exposed to atmospheric water vapor, which turns them into acids such as sulfuric acid and nitric acid. These acids are may not always fall back to the earth as rain; they can also become snow, fog, gas, or acidic salts. Because of this, a more accurate term for acid rain is “acid deposition.”
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