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GS Geography Physical Geography of World
Q.

What causes day and night cycle on Earth?
Explanation:

ANS. (A) 
The earth’s rotation on its own axis causes nights and days. As Earth rotates, the side of Earth facing the Sun experiences daylight, and the opposite side (facing away from the Sun) experiences darkness or night time. Since the Earth completes one rotation in about 24 hours, this is the time it takes to complete one day-night cycle.

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