Question

3. State at least four human activities that cause water pollution. 4. Why it is important to treat sewage from industries and agricultural waste befor releasing them into water bodies?​

Answer 1

Explanation:

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Answer 2

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Answer 3. The causes of freshwater pollution are varied and include industrial wastes, sewage, runoff from farmland, cities, and factory effluents, and the build-up of sediment.

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Answer:- 4.The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining water, called effluent, is discharged back to the environment. As solid material decays, it uses up oxygen, which is needed by the plants and animals living in the water.