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What are the major causes of water pollution? Explain.

Solution
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Several human activities leads to presence of several undesirable substances in water which causes water pollution. Various sources of different water pollutants are shown below.
Pollutant Source
Micro-organisms Domestic sewage
Organic wastes
Domestic sewage, decaying animals and plants, animal excreta and waste, discharge from food processing industries.
Plant nutrients
Chemical fertilizers
Toxic heavy metals
Chemical factories and industries
Sediments Strip mining and soil erosion
Pesticides Chemical used for killing fungi, weed, insects
Radioactive substances
Mining of uranium-containing minerals
Heat Water used for cooling in industries.

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