Question

why are the river pulluted?​

Answer 1

Answer:

Sources of pollution

If large amounts of fertilizers or farm waste drain into a river the concentration of nitrate and phosphate in the water increases considerably. Algae use these substances to grow and multiply rapidly turning the water green. This massive growth of algae, called eutrophication, leads to pollution.

Explanation:

Hope that helps you

Answer 2

Due to over of use of factory.And factory has no other way to dispose a chemical water.So they just pollute a river. Simple