Is the polar reversal caused by the earths inner and outer cores spinning 2/3 of a second faster than the crust?

  • Yes it is.

    The magnetic field is created by the core so as it is spinning faster it must be moving away from the north/south pole every two hundred thousand years the cycle is completed but it has been four to six hundred thousand since the last pole reversal. So I think the earth's rotation has slowed down.

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