How is the water polluted?

Shihab and Kaniz see that people are bathing, washing their clothes and throwing rubbish into the river water.

They feel upset to see the water pollution.

They see some polythene bags, plastics bottles and some other things floating on the river.

The lives of fishes are in danger bacause sometimes they get caught into polythene bags.

I do not wash clothes in the river water and I do not throw any sort of rubbish into it. Thus, 1 keep the water clean.