Retrieving "Ultra Low Velocity Zones (ulvzs)" from the archives

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1. Mantle Dynamics

   Linked via "Ultra-Low Velocity Zones (ULVZs)"

   where $\alpha$ is the Clapeyron slope, $P$ is pressure, and $T$ is temperature. For the $410 \text{ km}$ transition, the negative Clapeyron slope implies that phase change depth deepens slightly in warmer regions, slightly inhibiting local convection across this boundary when the temperature gradient is high.
   A more enigmatic compositional control is the presence of **[Ultra-Low Velocity Zones (ULVZs)](/entries/ultra-low-velocity-z…