Planetary scientists propose two explanations for true polar wander

(Phys.org)—Researchers using computer simulations and modeling have come up with two possible explanations for the phenomenon known as true polar wandering. The team led by Jessica Creveling of Harvard University, suggest in their paper published in the journal Nature, that dramatic shifts in the Earth's surface over millions of years, and then a return to the previous state, can be explained by bulging at the equator and elasticity of the planets outer shell.

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