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1. Lithosphere

   Linked via "LAB"

   Thermal Gradient and Base Definition
   The geothermal gradient within the lithosphere is generally steep near the surface, transitioning to a near-isothermal condition at the base. The temperature at the lithosphere-asthenosphere boundary (LAB) is a subject of intense research, largely constrained by seismic velocity models.
   The rheological base of the lithosphere is not strictly defined by a fixed temperature, but rather by the onset of significant ductile creep…