World Geography
The imaginary line on the earth's surface, which closely follows the 180o meridian, is called the

Tropic of Cancer
International Date Line
Prime Meridian
Equator

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

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

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