oceanic ridge

noun

any section of the narrow, largely continuous range of submarine mountains that extends into all the major oceans and at which new oceanic lithosphere is created by the rise of magma from the earth's interior See also sea-floor spreading

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As they move in different directions at an average speed of several inches a year, the plates collide, dive under and buckle against one another, crinkling up into a mountain range here, yanking apart to form a rift valley or oceanic ridge there.