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 areas.

(N/A) Causes of pollution of the river Ganga:
$(i)$ Disposal of untreated industrial effluents containing toxic chemicals.
$(ii)$ Human activities such as bathing,washing clothes,and the immersion of ashes or religious offerings.
$(iii)$ Discharge of untreated sewage from urban areas directly into the river.
Harmful effects on human health:
$(i)$ It leads to the spread of water-borne diseases such as cholera,typhoid,and dysentery due to the presence of pathogens.
$(ii)$ Consumption of contaminated fish or aquatic life from the river can lead to bioaccumulation of toxins,causing severe health issues in humans.