Answers

2014-12-07T20:13:05+05:30
pollution is the contamination of natural resources such as air..water ..and land through undesirable substances either biologically or chemically....some common pollutions are air pollution..water pollution etc
2 5 2
2014-12-07T20:13:42+05:30
The presence in or introduction into the environment of a substance which has harmful or poisonous effects.example throwing the waste papers ,rappers etc into the rivers or oceans ,seas etc are called as water pollution .
1 5 1