List two main causes of the pollution of water of the river Ganga. State how pollution and contamination of river water prove harmful for the health of the people of neighbouring area.

Two causes of pollution of the river Ganga:
(l) Disposal of industrial effluents.
(ii) Human activities like bathing, washing, immersion of ashes, etc.
(iii) Disposal of untreated sewage.
Harmful effects on health
– Spreads water-borne diseases.
– Consumptions of contaminated fishes.