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What factors influence how the Earth's liquid core rotates?


Scientist believe the liquid core of the Earth rotates and changes directions which in turn causes changes in the electro magnetic fields that surround the Earth. What might be some of those factors or forces that influence how the liquid core flows/rotates? What would cause molten magma to change flow direction? Might these forces be the same forces that cause air and water (oceans and seas) to flow in one direction or another?

 

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whonunuwho says

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Timothy Phelan (tphelan88) says

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