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Any undesirable change in physical, chemical or biological characteristics of natural resources like air, land, water or soil is known as pollution. All the agents that are responsible for this change are called as pollutants.
NCERT Books are now a days being used by most of the boards. Last year U. P. Board and M. P. Board also implemented NCERT Books as course books. Gujrat Board also converted NCERT Books in Gujrati to introduce in ...
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