according to the theory proposed by harry hess, what causes continents to move?\ncontinental drift\nmagnetic…

Brief Explanations:

Harry Hess proposed the theory of seafloor - spreading. Seafloor spreading is the process by which new oceanic crust is formed at mid - ocean ridges and moves away from the ridges, which in turn causes the continents to move. Continental drift is the general idea of continents moving, not the cause as per Hess. Magnetic polarity is related to the Earth's magnetic field and not the direct cause of continental movement. Deep - ocean trenches are a result of plate tectonics rather than the cause of continental movement.

Answer:

seafloor spreading