Pollution is defined as any undesirable change in the physical, chemical, or biological characteristics of air, water, land, or soil.
Pollution is defined as any undesirable change in the physical, chemical, or biological characteristics of air, water, land, or soil.
| Front | Pollution |
|---|---|
| Back | Is any indesirable change in physical ,chemical or biological characteristics of air ,water,land and soil. |
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