seamount
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An undersea volcano is a large mountain underneath the waters that when erupted it forms a new island.
atoll
Mid-ocean ridges
a mid ocean ringe
ocean ridge
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Undersea mountain range with a steep, narrow valley along its center.
mid ocean ridges
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.
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.