Which of the following happens at mid-ocean ridges and is essential for the process of plate tectonics being able to continue?

Mid-ocean ridge. 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.