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ocean ridge
seamount
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mid ocean ridges
An undersea volcano is a large mountain underneath the waters that when erupted it forms a new island.
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Mid-ocean ridges
A long undersea mountain chain is called a mid-ocean ridge. These ridges are formed by tectonic plates spreading apart, allowing magma to rise and create new oceanic crust. The Mid-Atlantic Ridge is one well-known example of a mid-ocean ridge.
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Undersea mountain range with a steep, narrow valley along its center.
A mid-ocean ridge is an undersea mountain chain where new ocean floor is produced through volcanic activity. Here, magma rises up from the Earth's mantle and solidifies as it cools, leading to the formation of new crust.