World Geography
The ionosphere contains ionized air that protects the earth from

the ultraviolet rays of the sun
the falling meteorites
None of these
the infrared rays of the sun

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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,
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

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