A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary. The two maps both provide evidence to how these ridges form because when comparing the two maps you will be able to find that the mid-ocean ridges are formed along the plate tectonic boundaries.
