ocean ridge
atoll
seamount
poiuydsa
yes
An undersea volcano is a large mountain underneath the waters that when erupted it forms a new island.
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
Mauna Loa, the world's largest active volcano, is found in the Hawaiian-Emperor seamount chain, a mostly undersea mountain range in the Pacific that is above sea level in Hawaii. The Hawaiian name "Mauna Loa" means "Long Mountain."