Answer:
Water
in rivers and lakes is being reduced as the requirements of rapid urbanisation,
population growth and industrialization cause more water to be drained out from
them. In place of this, huge amounts of untreated sewage and industrial effluents
are being emptied into the rivers and lakes.
This has caused the water bodies to become highly polluted. Human ashes
(due to cremation near water bodies), dead animals and leaching out of nitrogen
compounds from fertilised agricultural lands also increase the pollution.
Nutrient run-off in storm water from "sheet flow" over an
agricultural field or a forest is also another cause.
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