submarine volcanoes are volcanoes that happen to be underwater. submarine volcanoes are the most prolific volcanoes in the world, ejecting approximately 75% of the Earth's entire annual output of magma.

the water around submarine volcanoes classifies the eruptions as steam-blast (see phreatic eruptions/phreatomagmatic eruptions) eruptions.

water makes these volcanoes act unlike their counterparts on the surface. lava can flow through the water and form solid pillow-like structures unlike formations seen above water. in some cases, the lava cools so fast that it shatters (the black sand beaches of Hawaii were created almost instantly by cool sea water hitting the super-hot lava).

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