World Geography
The variation in the duration of the day and the night is due to earth's

revolution around the sun
inclination of an angle of 601/2 degrees
rotation on its axis
both (a) and (b)

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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:

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

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