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

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

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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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