The summits of Cleveland and Carlisle volcanoes in the Aleutian Islands seen in 2016. Credit: Taryn Lopez, AVO/UAF/USGSSign up for our email newsletter for the latest science newsThe Three Sisters area in Central Oregon seen in October, 2020. Credit: Landsat 8, USGS.The six volcanoes proposed to be part of a large caldera system in Alaska seen in August 2020. Credit: Landsat 8, USGS.1 free article leftWant More? Get unlimited access for as low as $1.99/monthAlready a subscriber? or Want more?Keep reading for as low as $1.99!Already a subscriber? or Related ContentStay CuriousJoinOur...…The summits of Cleveland and Carlisle volcanoes in the Aleutian Islands seen in 2016. Credit: Taryn Lopez, AVO/UAF/USGSSign up for our email newsletter for the latest science newsThe Three Sisters area in Central Oregon seen in October, 2020. Credit: Landsat 8, USGS.The six volcanoes proposed to be part of a large caldera system in Alaska seen in August 2020. Credit: Landsat 8, USGS.1 free article leftWant More? Get unlimited access for as low as $1.99/monthAlready a subscriber? or Want more?Keep reading for as low as $1.99!Already a subscriber? or Related ContentStay CuriousJoinOur...WW…