(a) Name any five sources of water(other than rivers)(b) Describe how, the water of river Ganga has been highly polluted.

(a) Five sources of water are lakes, rains, ponds, wells and glaciers.

(b) The water of river Ganga has been highly polluted with industrial discharges and untreated sewage disposal.

The pollution of the river Ganga is chiefly due to human activities like bathing in a holy river, washing clothes, immersion of ashes of the dead remnants into its water.