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
Which among the following statements is correct about Mesa?

It is a secluded hollow
It is a narrow pass or gorge between mountains or hills
It is an elevated area of land with a flat top and sides that are usually steep cliffs
It is a small hill

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World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

infrared rays from the sun
ultraviolet rays from the sun
None of these
the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun

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