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Sources of Tectonic Stress
ffl Shear Traction at the base of the lithosphere (drive
or resist)
ffl Net slab pull at subduction zones
ffl Ridge Push
ffl Trench suction on overriding plate
Local Enhancements
ffl Bending from surface loads
ffl isostatic compensation ! plastic
ffl down bending of oceanic plate
Whatever the details, the system is ultimately driven
by convective heat loss from the core where the heat­
ing mechanisms is decay of Uranium that was de­
posited there via Supernova