"What Lies Beneath" --Scientists Map the Yellowstone Supervolcano: Last Massive Eruption was 630,000 Years Ago

For the first time, scientists have started to map the vast subterranean systems that underlie the massive Yellowstone Supervolcano to better predict if and when a 'super-eruption' could occur - something that hasn't happened in 630,000 years, but when it...