Air pollution is caused by transport exhaust fumes and emission of gases like $S O_{2}$ , $C O_{,} N O_{2}$ from industries. Similarly, water pollution is caused by _____________.

Sewage

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Crop cultivation

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Rain

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Soil erosion

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Solution

The correct option is A Sewage
Human sewage is an important source of water pollution. If untreated sewage gets into rivers, microorganisms decompose it. They use oxygen from the water for aerobic respiration. As a result, there is less oxygen dissolved in water, so aquatic organisms such as fish and insects may be unable to survive. Like this, sewage is causing water pollution.
So, the correct option is A.

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Air pollution is caused by transport exhaust fumes and emission of gases like SO2, CO,NO2 from industries. Similarly, water pollution is caused by _____________.

Air pollution is caused by transport exhaust fumes and emission of gases like $S O_{2}$ , $C O_{,} N O_{2}$ from industries. Similarly, water pollution is caused by _____________.