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

They occur at the mature stage of the river development
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,
It is a deep depression in a stream bed at the base of a waterfall

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World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
infrared rays from the sun
ultraviolet rays from the sun
None of these

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