Mantle Convection
A - Newly formed rock at the mid-ocean ridge is warmer and less dense than the older rock. The new rock slides down and away from the ridge, pushing the plate outward.
B - A small-scale conduction current in the mantle wedge, pushes the plate further away from the ridge and back into the mantle.
C - As magma rises, it pushes the plates apart.
D - At subduction zones, the old denser plate sinks below the less dense tectonic plate. This process relies on gravity.
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Mantle Convection
A - Newly formed rock at the mid-ocean ridge is warmer and less dense than the o...
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