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Lava from the Kilauea eruption engulfs a nursery in Kapoho, Hawaii on June 2, 2018. Hawaii Army National Guard / Sgt. John Schoebel

Did you know that the U.S. is one of the most volcanic countries in the world? There are more than 160 active volcanoes in the nation—but which ones could cause the most damage if they erupt?

On Thursday, the U.S. Geological Survey (USGS) released an update of its national volcanic threat assessment for the first time since 2005 and categorized 18 volcanoes as "very high threat."

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