What causes the formation of mountain ranges along the ocean floor? Underwater volcanos erupt, creating underwater mountain chains. Sedimentary rock is forced together forming mountain ranges. Sediment from rivers causes added sediments until mountains are formed. Plate tectonics pulls the ocean floor apart and magma pushes up forming mountains.
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It's formed by the movement of the Earth's tectonic plates. ... As the great plates push apart, mountains and valleys form along the seafloor as magma rises up to fill the gaps. As the Earth's crust spreads, new ocean floor is created.
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