What Caused The Sudden Increase In Earth's Spin?

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Earth had its shortest day on July 26, 2022 but what might be causing Earth to spin faster?

Melting of the glaciers?
Motions of inner molten core?
Seismic activity?
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Melting of the glaciers. If you could think about and conceive a solid ball with a perfect circle with no surface tension on it it spins freely with really no resistance. Let's say you have a magnetic field that holds water around this ball when it rotates the fluid goes back and forth almost like an ocean and given that there's more water on this planet due to the glaciers melting the extra centrifugal from the water on the surface of this ball has the capacity to spin that object just a little bit faster. Let me know if I'm wrong. Just throwing out there what I know.

travisrose