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Beginning of Paper
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Acid from the clouds
Lake Barkevatn in Aust-Agder county used to have healthy stocks of trout and perch. As a result of acid rain, the trout stock died out in the mid-1970s and the perch stock at the beginning of the 1980s.
· Precipitation that is polluted by sulphur dioxide (SO2) and nitrogen oxides (NOX) is known as acid rain.
· Acidity is measured in pH units: the lower the pH, the more acidic the substance. Un ....
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Middle of Paper
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.... sulphate in sea salts, and sulphur compounds produced by marine organisms. On a global basis, emissions from such sources are of about the same order of magnitude as those from the combustion of fossil fuels (coal and oil), but like many other essential substances, sulphur is harmful in excessive amounts. Much of Europe and North America is suffering from sulphur deposition that exceeds critical loads as a result of the large amounts of such compounds generated ....
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