Electric Material in Mantle Could Explain Earth's Rotation
Under pressure. The disk of iron monoxide (FeO) inside the diamond anvil, connected to gold (Au) electrodes. The diamond anvil that compressed the iron monoxide, rigged up with a machine that measured how well the material conducted electricity ( KENJI OHTA
Electric Material in Mantle Could Explain Earth's Rotation
By Kate McAlpine June 21, 2018 , 12:25 PM
When it comes to Earth's rotation, you might think geophysicists have pretty much everything figured out. Not quite. In order to explain some variations in the way our planet spins, Earth's mantle—the layer of hot, softened rock that lies between the crust and core—must conduct electricity, an ability that the mantle as we know it shouldn't have. Now, a new study finds that iron monoxide, which makes up 9% of the mantle, actually does conduct electricity just like a metal, but only at temperatures and pressures found far beneath the surface.
Earth's spin isn't flawless. Geophysicists have discovered that the time it takes our planet to complete one rotation—the length of a day—fluctuates slightly over the course of months or years. They've also noticed extra swing in the predictable wobble of Earth's axis of rotation, like the swaying of a spinning top. The variations are probably caused by the solid iron inner core, liquid metal outer core, and rocky mantle rotating at slightly different rates. Friction helps bring them into line, and the magnetic field of the outer core can pull on the metal inner core. But to really fit the observations, the core should also exert its magnetic tug on the mantle, says Bruce Buffett, an earth scientist at the University of California,......read more @ https://techablyengineering..com/2018/06/electric-material-in-mantle-could.html

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