What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.

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Solution

Sewage is a liquid containing wastes that are disposed of by households, industrial and agricultural activities in the water. It is harmful to discharge untreated sewage into rivers or seas because it can pollute the whole source of water. Sewage contains harmful substances and disease-causing organisms. It is, therefore, dangerous to release untreated sewage in the water.

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