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

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

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World Geography
The period of daylight

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

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