Question

what are the causes of decrease in volume and velocity of river`s water?

Answer 1

Answer:

A great deal of friction is created between water molecules and these stones as the river flows past them; in rough channels, the resistance caused by this friction reduces the river's velocity.

Explanation:

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Answer 2

Answer:

the main cause of slow down of water or water pollution is due to the blockage of water. This Blockage of water is caused by the 'Plastics'.