Question

What are the main sources polluting the river water? How the pollution is affecting rivers?

Answer 1

Answer:

Chemical waste as industrial by-products. Fertilizers containing nutrients--nitrates and phosphates—which are found in storm water runoff from agriculture, as well as commercial and residential use (see nutrient pollution) Heavy metals from motor vehicles (via urban storm water runoff) and acid mine drainage

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Answer 2

Explanation:

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.