It is called the Yellowstone Caldera.
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The closest active volcano to Pennsylvania is the Soufriere Hills volcano on the Island of Montserrat in the Caribbean, located about 1,800 miles from the nearest part of Pennsylvania. Also worth mentioning is the dormant supervolcano in Yellowstone about 1,500 miles from Pennsylvania.
mt ruapaehu in newzealand
A composite volcano or Strata Volcano.
mount etna is a volcano in italy
A volcano is easy it's an active volcano but there are thousands that could erupt tomorrow