Why does the Mediterranean have so many volcanoes?
The Mediterranean is ultimately prone to tectonic (and volcanic) activity as a result of the collision of the African plate into the western portion of the Eurasian plate.
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Three of the seven supervolcanoes in the world are in the U.S.:
Rising gradually to more than 4 km (2.5 mi) above sea level, Hawaii's Mauna Loa is the largest active volcano on our planet. Its submarine flanks descend to the sea floor an additional 5 km (3 mi), and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km (5 mi).