Question

what is sewage? Explain why it is harmfull to discharge untreated sewage into rivers or seas ​

Answer 1

Answer:

-Sewage is a liquid containing wastes which is disposed by households, industrial and agricultural activities in water.

It is harmful to discharge untreated sewage into rivers or seas as :

-it can pollute the whole sources of water.

-it contains harmful substances and disease causing organisms.

Answer 2

Answer:  Sewage is a liquid containing wastes from households, industrial and agricultural activities discharged into water.

It is harmful to discharge untreated sewage into rivers or seas because it can pollute the whole water source.

Sewage contains harmful substances and disease-causing organisms.

Therefore, it is dangerous to release untreated sewage in water.

Best Of luck for your science exam