Question

what is water pollution? write four main sources of pollution in indian rivers

Answer 1

Any undesirable physical, chemical and biological change in water which are harmful for living beings called water pollution.

Answer 2

contamination of water by various harmful substances is called water pollution.
the main sources of pollution in Indian river are:-)
1 domestic and industrial waste.
2 solid garbage thrown directly into the water.
3 animal carcasses and half burned and unburned human bodies.
4 mass bathing