World Geography
The ground water that occurs when flow of the subterranean water is not confined by the presence of impermeable layers is called

unconfined groundwater
aquifer
artesian
confined groundwater

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

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

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