Answers

2015-06-25T09:33:49+05:30
Contamination of water, air and land by unwanted things is called pollution.
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2015-06-25T09:37:32+05:30
Adding harmful contaminants to the environment is known as pollution.pollution are of many types such as: 
1. air pollution
2.water pollution
3.land pollution
4. radiocative contamination(nuclear pollution)

hope it helps...........
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