How are ridges in oceans formed?

Mid-ocean ridges form when tectonic plates meet beneath the ocean and ridge-push, slab-pull or do both to create a subduction zone. Over time, one plate raises up. This, along with the simultaneous magma buildup, creates a submarine mountain range, or ocean ridge. read more

Ridges and trenches are caused by continental drift, the earth is covered by a series of tectonic plates that float on a mantle of molten rock. The wide trenches are caused by plates moving away from each other and the ridges are caused by plates overlapping with one sliding under the other. This is called subduction. read more

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. read more