The world rotates because of leftover momentum from the solar nebula that Earth (as well as the rest of the planets and the Sun) formed within. The solar nebula starting spinning when a supernova sent a shock through a cloud of molecular hydrogen. Each molecule in the cloud of hydrogen had momentum, so when they came together the momentum needed to be conserved. Once the solar nebula started spinning, the planetary disk was created. Once it flattened out, the planets clustered together from gravity and began to accumulate more gravity. The momentum of the particles then caused the planets to rotate.
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