Ever been mesmerized by the swirling colors of Grand Prismatic Spring and wondered what fuels that otherworldly boil? It ...

Yellowstone would blast millions of tons of sulfur ... the global economy billions. A Yellowstone supervolcano eruption would create no-fly zones across most of North America for months ...

It's one of the world's largest active volcanoes in the world – officially described as a 'supervolcano'. And if it erupted today, it's thought Yellowstone in the northwestern United States ...