How does convection current and slab pull work together

As one plate subducts, it sets up convection currents in the upper mantle that 'exert a net trenchward pull'

Explanation:

As one plate subducts, it sets up convection currents in the upper mantle that 'exert a net trenchward pull' ie, acts to suck both the plates together (Wilson, 1993). Associated with the slab suction force is the idea of trench roll-back.

Explanation:

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