Question

How do city Sewage and industrial waste discharged into the rivers become a source of water pollution

Answer 1

As they release toxics into water they become poisonous

Answer 2

city sewage contains so many non-biodegradable things and industrial wastage contains so many poisonous chemicals which when together mixed and fell it into the river the whole area of the river become pollutants and spread throughout it and in this way the river become a source of water pollution
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