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asked 8 months ago
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Well, if you think about it, the earth is pretty irregularly-shaped, what with the mountains the the undersea trenches and all. But the earth is round because under the crust is a liquid layer of magma. When liquid gathers around a gravitational point, it always forms a perfect sphere. It's impossible for the earth to be anything but round because of the physics of fluid dynamics. But also, if the earth were a cube, it probably couldn't retain an atmosphere capable of sustaining life, at least not everywhere.
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