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Why are there volcanoes outside the ring of fire?

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The 'Ring of fire' around the Pacific represents subduction zones, (destructive plate margins), where oceanic crust (basaltic) is diving under continental crust (granitic). read more

The Ring of Fire is the term for the aggregate active plate margins of the Pacific region (including Indonesia), but there are other plate boundaries - the Mediterranean area, for instance, contains multiple small plates, and some of the volcanoes in that area are quite active: Vesuvius, for instance, and Stromboli. read more

Yes. The ring of fire- or continential plate subduction zones are only one cause for volcanoes. the most obvious example of volcano outside one of these regions is the ones on Hawaii. It's essentially a hot spot in the middle of the Pacific plate. You can see how, over the years, the plate has moved over the hotspot and created a chain of islands. read more

Most of the Earth's volcanoes are located around the Pacific Ring of Fire because that the location of most of the Earth's subduction zones. A subduction zone is a place where one plate of oceanic lithosphere (= the crust + uppermost mantle) is shoved under another plate. read more

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What is the "Ring of Fire?"
volcano.oregonstate.edu