World Geography
Which among the following statements is not correct about Plunge pool?

It is created by the erosional forces of cascading water
They are often very deep, generally related to the height of fall and the volume of water,
They occur at the mature stage of the river development
It is a deep depression in a stream bed at the base of a waterfall

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World Geography
The main objective of multi-purpose river projects are

All of these
extension of irrigation facilities by constructing dams to store surplus water during the rainy seas
power generation by constructing hydro power stations
flood controls and making rivers navigable

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