World Geography
The magnetic field of earth, Magnetosphere expands to about

None of these
64,000 km above the earth's surface
8000 km above the earth's surface
9600 km above the earth's surface

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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 period of daylight

is nearly constant near the equator
varies with latitude and the season
All of these
reaches a maximum of 24 hour in the polar zones in summer

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