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

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

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World Geography
The Penumbra is

the outer portion of the moon's shadow
both (a) and (b)
None of these
formed by the tangent that intersects between the sun and the moon

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