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