Answers

2015-02-17T20:52:29+08:00
Pollution is caused by man-made structures and is also a by-product of civilization and technology. There are types of pollution, land, air, water, noise, and light pollution. HI :) 
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2015-02-18T19:42:51+08:00
Pollution is the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
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