Submitted by BayRunner t3_10jpa0r in askscience
alexm42 t1_j5o9pyn wrote
Reply to comment by maineac in What are the forces on Earth’s Inner Core that change its speed? by BayRunner
Not caused by the pressure (that's what stars do and the Earth isn't one) but rather the heat of radioactive decay. It's also believed that tidal forces from the Moon create some heat.
maineac t1_j5ohv48 wrote
Thank you.
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