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There are volcanoes in the Atlantic but they are mostly underwater. The Atlantic ocean is getting wider because the two plates for the eastern and western halves are drifting apart. This contrasts with the Pacific ocean which has its own plate that produces surface volcanoes when it hits other continental plates.
Volcanoes are mostly underwater all over the globe. There are an estimated one million (not a typo - one million) submarine volcanoes. The Atlantic Basin is fairly straightforward - it has a mid-oceanic ridge running down the center. The Pacific is far more complex. It is ringed by subduction zones (which also produce underwater volcanoes, as well as those on land) but also has several mid-ocean ridges. So the Pacific does not produce surface volcanoes as opposed to submarine volcanoes, but surface volcanoes in addition to (even ore numerous) underwater volcanoes.
Maybe you're thinking of Atlantis, another mythical civilization that allegedly became totally submerged beneath the Atlantic Ocean after a devestating cataclysm that made it sink. See map: https://en.wikipedia.org/wiki/Mu_(my...ria_mumap2.jpg
ALL islands in any body of water anywhere are either hill peaks or mountain peaks that are simply exposed above the surface of the water that surrounds the submerged parts of the hills and mountains. Likewise, all exposed hill peaks or mountain peaks surrounded by water anywhere are islands. That's what the word island means. Very small or newly emerging islands may be called islets, skerries, cays or keys.
Volcanoes are mostly underwater all over the globe. There are an estimated one million (not a typo - one million) submarine volcanoes. The Atlantic Basin is fairly straightforward - it has a mid-oceanic ridge running down the center. The Pacific is far more complex. It is ringed by subduction zones (which also produce underwater volcanoes, as well as those on land) but also has several mid-ocean ridges. So the Pacific does not produce surface volcanoes as opposed to submarine volcanoes, but surface volcanoes in addition to (even more numerous) underwater volcanoes.
And lots of hydrothermal vents on the sea floor that are called black smokers or white smokers.
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