Are there volcanoes under the sea?

Volcanoes form under the sea in the same way as on land. When two oceanic plates collide, one may get pushed under the other. The heat generated by the crash causes one plate to melt and form magma. The hot magma rises and forms an underwater volcano, just as it does on land. The Vailulu volcano in Ta’u Island in the Pacific Ocean is an underwater volcano.

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