According to wikipedia,Rain acid is water which falls from the sky with deposition of acidic components.It is caused by carbon dioxide in the atmosphere combines with water molecules to form carbonic acid. Acidic deposition occurs when sulfur dioxide and nitrogen oxides in the atmosphere react with oxygen in the air to form sulfuric acid (H2SO4) and nitric acid (HNO), and falls to the surface as rain or snow. The deposition usually has to have a pH 5.0 or lower
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