World Geography
The variation in the duration of the day and the night is due to earth's

rotation on its axis
both (a) and (b)
revolution around the sun
inclination of an angle of 601/2 degrees

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World Geography
The initial increase of magnetic field in magnetic storms is caused

when there is a large decrease in field intensity
when the gust wind itself engulfs the magnetosphere
None of these
when the shock wave, associated with the gusty solar wind, compresses the magnetosphere

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