Answers

2014-08-31T00:01:45+05:30
The introduction of harmful substances in the environment is called pollution.There are different types of pollution-Soil pollution,air pollution,water pollution,noise pollution,nuclear pollution.Its sources are industries,vehicles,combustion,construction,mining,agriculture,etc.
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2014-08-31T07:55:53+05:30
Pollution can happen to anything .
pollution is something unwanted to some other thing .
eg air land pollution 
note humans also can get polluted 
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