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
when the shock wave, associated with the gusty solar wind, compresses the magnetosphere
None of these

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World Geography
Which among the following period in the demographic history of India is called the Period of Stable Population?

1891 to 1921
1921 to 1951
1981 to Present
1951 to 1981

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