World Geography
The magnetosphere becomes unstable during the magnetic storms during a period of

storm sudden commencement phase
main phase
None of these
initial phase

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World Geography
Which among the following statements is/are correct about the Thermosphere?It lies upto an altitude of 80 km from the earth’s surface.It contains electrically charged particles known as ions.The temperature here starts increasing with heights.The International Space Station and other satellites orbit in this layer.Select the correct code from the options given below:

Only 2, 3 & 4
Only 3 & 4
1, 2, 3 & 4
Only 1, 3 & 4

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World Geography
Which among the following region has the highest density of rail network?

South east Asia
North America
Eastern Asia
Western Europe

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