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Geologists explore the violent events that created Yellowstone, the world's first national park, and reveal that it still rests on a vast super volcano that is overdue for an eruption.
- Jonathan KeebleSelf - Narrator (UK)
- Tony PraveSelf - Geologist, University of St. Andrews
- Mike PolandSelf - Geologist, U.S. Geological Survey
- Nick PetfordSelf - Bournemouth University
- Charles MerguerianSelf - Geologist, Hofstra University
- Karl E. KarlstromSelf - Geologist, University of New Mexico
- Bob AndersonPhotographer, University of Colorado at Boulder
- Bill McGuireSelf - Geologist, University College London