Question: why does the earth rotate? 

Answer: well, i don't know WHY it rotates. it just does, it's part of nature.\n\nbut if it didn't rotate on it axis then the night's darkness would last for 6 months. then it would be daylight outside for 6 months.\n\nif the earth didn't revolve around the sun and it didn't rotate then it would always be dark for one side of the planet and bright for the other side.
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