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"He created the heavens and the earth truthfully. He rolls the night over the day, and rolls the day over the night."

39:5

The earth spins on its axis once every 24 hours. If it did not spin, the oceans would empty all their waters and if it spun much faster it would disperse into empty space.

The spinning movement is also responsible for the night and day, without which one half of the earth would be under continuous sunlight and heat up excessively while the other half would be submerged in total darkness and freeze to death.

The Quran speaks of the spinning of the Earth:

"He (God) rolls the night onto the day and rolls the day onto the night" 39:5

The word "rolls" is very accurate in describing the spinning movement, as well as confirming the fact that the earth is round. Fourteen centuries ago, when the Quran was revealed, it was still thought that the earth was flat.