Question

why are most of the rivers of Ganga plain heavily populated with chemical​

Answer 1

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• (a) industries discharging untreated sewage into the river water.
• In some rituals dead bodies are directly thrown into the river thus polluting the river water. 

Answer 2

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1. (a) industries discharging untreated sewage into the river water.
2. In some rituals dead bodies are directly thrown into the river thus polluting the river water.