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It comes down to Isaac newton's first law of motion, which states that an object in motion will remain in motion until acted upon by an outside force. When the earth coalesced into a rocky body from a molten cloud of hot dust, it began to rotate, much the same way a figure skater spins faster when she draws her arms closer to her body. This rotation is still happening 4+ billion years later, because no outside force has significantly altered it since then.

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12y ago

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