US Department of the Interior @Interior
Is Yellowstone a super volcano or a caldera system? Does Yellowstone erupt every 600,000 years? @USGS scientist-in-charge at the Yellowstone Volcano Observatory busts myths about one of the most misunderstood places on earth. https://t.co/SIeRqHYP3z https://t.co/Ox58BP1DC1 — PolitiTweet.org