- ...that Regal Mountain (pictured), an eroded stratovolcano in the Wrangell Mountains, is the third-highest thirteener (a peak between 13,000 and 14,000 feet in elevation) in Alaska?
- ...that Canadian scientist Bill Mathews was a pioneer in the study of subglacial eruptions and volcano-ice interactions in North America?
- ...that thermal vent ecosystems have been discovered in the Aegean Sea, in the caldera of Kolumbo underwater volcano?
- ...that Hawaii's Chain of Craters Road has been blocked repeatedly by lava flows from Kīlauea volcano since it was built in 1928?
- ...that Halemaʻumaʻu Crater in Hawaiʻi Volcanoes National Park erupted explosively on March 19, 2008 for the first time since 1924?
- ... that Bowie Seamount on the British Columbia Coast of Canada is one of the most biologically rich submarine volcanoes on Earth and was an active volcanic island throughout the Last Glacial Period?
- ... that the Lava River Cave in Newberry National Volcanic Monument is the longest known uncollapsed lava tube in Oregon, U.S.?
- ... that the early pre-Columbian site of Xochitecatl in Mexico was abandoned for centuries after the Popocatépetl volcano erupted around 150 AD?