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Why does the Earth spin?

Dear Dr. Universe: Why does the Earth spin? -Morven, 8, Dundee, Scotland; Judith, 9, Sabah Malaysia; Mara, 11, USA

Dear Morven, Judith, and Mara:

No matter how still we stand, or if we’re in Scotland, Malaysia, or the United States, we are always spinning. Our Earth spins at a constant, very fast speed as we make a trip around the sun. » More …