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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.
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Hot, less dense material below the Earth’s crust rises towards the mid-ocean ridge. As this material flows sideways, it creates a crack in the crust where magma will flow out. This magma cools down and becomes the new seafloor.
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