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If you deliberately drilled a huge hole at the North Pole, and allowed all the earth's magma to spill out, as the earth tilted, could the weight shift, cause the earth to "flip" upside down, thus causing a reversal? Sounds plausible to me.
Answer 1:

No. The Earth would not tilt or flip. The magma would spill out onto the surface as a lava flow, and then the lava would freeze to rock and plug the hole you drilled. The Earth is not spinning upright on any sort of surface like a spinning top: we draw maps such that north is up just by convention. The direction of gravity is inward toward the center, not southward. People in Antarctica do not go flying off into space.



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