Question

The naturally flowing single stream of water is called.
(a) Waterfall
(b) Tributary
(c) River
(d) All of these

Answer 1

All of these is a right answer.

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Answer 2

The naturally flowing single stream of water is called a river.

Explanation:

A river is the term that denotes natural flowing water between defined banks. River water is usually freshwater that originates from the mountains and flows along the plains and other terrain, empties into another river, lake, sea or ocean. In rare cases, a river might flow into the ground and dry out at the end instead of reaching another water body.

River water makes up only 0.025% of Earth's total fresh water supply, but it is a vital part of civilization. Many ancient civilizations developed along the river banks.