Question

unit exam - earth systems
what is the driving force behind the movement of tectonic plates at divergent boundaries?
gravitational forces
magnetic fields
magma welling from below

Explanation:

At divergent boundaries, tectonic plates move apart. Magma from the mantle wells up to fill the gap. Gravitational forces mainly act on mass - related movements like landslides. Magnetic fields are not the driving force for plate movement at divergent boundaries.

Answer:

magma welling from below