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Space Shuttle
Grade 6
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Earth and the Sun

Earth spins, or , on its axis. An axis is an imaginary through Earth from the North Pole to the South Pole. It takes Earth approximately 24 to make one rotation on its axis. Because of this motion, any place on Earth experiences a(n) of day and night. We know Earth is spinning because of data collected by . A Frenchman named also discovered evidence of Earth spinning. He hung a heavy that knocked down many pegs. Earth’s shape is not really a(n) . At the North and South Poles, Earth is slightly . And at the , Earth bulges slightly.