Question

How has human polluted rivers?

Answer 1

Pollution can be in a variety of forms:

Rubbish like crisp packets, newspaper and bags.

Oil

Poisonous substances

Cans, bottles and other solid objects

Human waste / excrement

causes

Agriculture

Farmers put fertilizers and pesticides on their crops so that their crops grow better. But these fertilizers and pesticides can be washed through the soil by rain, to end up in rivers. Fertilizers and pesticides are harmful because they cause algae to grow. The algae then destroy water plants

Factories
Factories use water from rivers to power machinery or to cool down machinery. Dirty water containing chemicals is put back in the river. Water used for cooling is warmer than the river itself, and this is also a form of pollution