World Geography
The major events of Pre-Cambrian era include

formation of crust, continents and oceans
All of these
formation of crust, birth of oldest known rock, origin of life
formation of present day atmosphere

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

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

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