summary of pollution of air and water class 8 science
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Carbon dioxide, argon, methane, ozone and water vapour are present in very small quantities. When air is contaminated by unwanted substances which have a harmful effect on both the living and non-living, it is known as air pollution. The substances which contaminate the air are known as air pollutants.
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summary of air and water pollution
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water is polluted when water is mixed with impurities and air is polluted by smoke and other deadly pollutents
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