Retrieving "Low Viscosity Interlayer Boundaries" from the archives

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1. Planetary Differentiation Processes

   Linked via "low-viscosity interlayer boundaries"

   Secondary Differentiation: Isostatic Rebound and Tectonics
   Long after initial differentiation, internal temperature gradients can induce secondary differentiation processes, often manifesting as mantle convection and plate tectonics. In bodies with sufficient internal heat and the presence of low-viscosity interlayer boundaries (such as the $\text{Ol} + \text{Wadsleyite}$ transition zone in terrestrial planets), localized melting and resurfacing occur.
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