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Essay heading: Acid Rain
 
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Issue: Science
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Date added: July 4, 1998
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No of pages / words: 13 / 3384
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Clean air also contains naturally occurring gases such as carbon dioxide. The interaction between the water droplets and the carbon dioxide in the atmosphere, and to a lesser extent, from chlorine which is derived from the salt in the sea, gives rain an average pH of about 5.6, making even clean rain slightly acidic...
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Other natural sources of acids and bases in the atmosphere may lower or raise the pH of unpolluted rain. However, when rain contains pollutants, especially sulfur dioxide and nitrogen oxides, the rain water can become very acidic. Acid rain does not account for all of the acidity that falls back to earth from pollutants...
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