Ocean ridges form as a result of _______.
the upwelling of magma from the asthenosphere
sediment being deposited from the ocean
all of the above
The mid-ocean ridge is a volcanic feature caused by the spreading apart of oceanic plates as part of plate tectonics, and is initially formed as a result of changes in the convection currents which seek the least resistant point to the surface. [ The sea floor at the ridges are uplifted by rising magma. The rising magma is part of a process of heat transfer from the interior of the Earth to the
surface known as a convection current. As the rising magma cools, it forms new crust which becomes part of the ridge. ]
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