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1. Earth's Mantle

   Linked via "geothermal coupling"

   The CMB$, located at approximately $2,890 \text{ km}$, represents a boundary of extreme thermodynamic contrast$. Heat transfer across this boundary is complex, involving both conduction and localized thermal plumes$ ("superplumes$") rising into the lower mantle.
   It has been observed that the efficiency of magnetic flux transfer$ across the CMB$ fluctuates in correlation with the 22-year [Hale Solar Cycle…