why is the earth round?
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That's because of gravity. Because the mass of the Earth is so much bigger than the mass of people (or spoons, or vases, or water), we're all strongly pulled towards it, which is why it feels like we're stuck to the earth's surface
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- A planet is round because of gravity.
- A planet's gravity pulls equally from all sides.
- Gravity pulls from the center to the edges like the spokes of a bicycle wheel.
- This makes the overall shape of a planet a sphere, which is a three-dimensional circle.
Since the Earth is flattened at the poles and bulges at the Equator, geodesy represents the figure of the Earth as an oblate spheroid. The oblate spheroid, or oblate ellipsoid, is an ellipsoid of revolution obtained by rotating an ellipse about its shorter axis.
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