Characters played by Corey Johnson
Narrator
Characters played by Jonathan Keeble
Self - Narrator (UK)
Self - Narrator
Characters played by Tony Prave
Self - Geologist
University of St. Andrews
Self - Univ. of St. Andrews
Characters played by Mike Poland
Self - Geologist
U.S. Geological Survey
Self - Geophysicist
U.S. Geological Survey
Characters played by Nick Petford
Self - Bournemouth University
Self - Geologist
Bournemouth University
Characters played by Charles Merguerian
Self - Geologist
Hofstra University
Characters played by Karl E. Karlstrom
Self - Geologist
University of New Mexico
Self - University of New Mexico
Characters played by Bill McGuire
Self - Geologist
University College London
Self - University College London
Characters played by Bob Anderson
Photographer
University of Colorado at Boulder
Self - Geologist
Self - Geologist
University of Colorado at Boulder
Characters played by Andreas Bauder
Self - Glaciologist
Self - Glaciologist
Swiss Fed. Inst. of Technology
Characters played by Alan Lester
Self - University of Colorado at Boulder
Characters played by John Douglass
Self - Geologist
Paradise Valley Community College
Characters played by Andrew Lambert
Self - King's College London
Characters played by Charlie Paull
Self - Marine Geologist
Monterey Bay Aquarium Research Institute
Characters played by Jen Smith
Self - Geologist
Washington Univ. in St. Louis
Characters played by Timothy McCue
Self - Engineer
Goderich Salt Mine
Characters played by Shelton Johnson
Self - Park Ranger
Yosemite National Park Service
Characters played by Charles Mandeville
Self - American Museum of Natural History
Characters played by William Hartmann
Self - Planetary Scientist
Planetary Science Institute
Arizona
Characters played by Hank Heasler
Geologist
Yellowstone National Park
Self - Park Ranger
Characters played by John Houston
Self - Consultant Hydro-Geologist
Characters played by Toni Bürgin
Self - Paleontologist
Characters played by Walter Mooney
Self - U.S. Geological Survey
Characters played by David Kring
Self - Geologist
NASA
Characters played by Kenton Cool
Geologist
Self - Mountaineer
Characters played by James Howard
Self - Geologist
CASP Research
Characters played by Katharine Bull
Self - Alaska Volcano Observatory
Characters played by Tom Casadevall
Self - Geologist
U.S. Geological Survey
Characters played by Richard Goldfarb
Self - Geologist
U.S. Geological Survey
Characters played by Peter K. Swart
Self - Marine Geologist
University of Miam
Characters played by Michael Zolensky
Self - Cosmic Mineralogist
NASA Johnson Space Center
Characters played by Jake Lowenstern
Self - Yellowstone Volcano Observatory
U.S. Geological Survey
Characters played by Brian Atwater
Self - U.S. Geological Survey
Characters played by Paul Olsen
Self - Paleontologist
Columbia University
Characters played by Walter Smith
Self - Geophysicist
NOAA
Characters played by Jeff Sutton
Self - Hawaiian Volcano Observatory
Characters played by Pete La Femina
Self - Volcanologist
Pennsylvania State University
Characters played by Ken Hudnut
Self - U.S. Geological Survey
Characters played by Michael Sheridan
Self - Volcanologist
University of Buffalo
Characters played by John G. Spray
Self - Geologist
University of New Brunswick
Characters played by Marisa Vera
Self - Dirección General de Aquas
Characters played by John Zawiskie
Self - Geologist
Cranbrook Institute of Science
Characters played by Peter de Menocal
Self - Ocean Geologist
Columbia Univ.
Characters played by John Underhill
Self - Univ. of Edinburgh
Characters played by Bryan Law
Self - Geologist
University of Nevada
Reno
Characters played by Mark Feldmann
Self - Geologist
Characters played by Ian Miller
Self - Denver Museum of Nature & Science
Characters played by Clive Oppenheimer
Self - Volcanologist
University of Cambridge
Characters played by Chris Ralph
Prospector
Self - Gold Journalist
Characters played by Daniel Dzurisin
Self - Geologist
U.S. Geological Survey
Characters played by Bill Evans
Self - U.S. Geological Survey
Characters played by Mike Searle
Self - Geologist
University of Oxford
Characters played by Steven E. Brown
Self - Geologist
Illinois State Geological Survey
Characters played by Marli Miller
Self - Geologist
University of Oregon
Characters played by Dougal Jerram
Self - Earth Scientist
Durham University
Characters played by Andy Bowen
Self - Woods Hole Oceanographic Inst.
Characters played by Simon Boxall
Self - University of Southampton
Characters played by Marcus Bursik
Self - Geologist
University at Buffalo
Characters played by Linda Godfrey
Self - Geologist
Rutgers University
Characters played by Lisa A. Morgan
Self - Geologist
U.S. Geological Survey
Characters played by Matthew Roberts
Self - Glaciologist
Icelandic Meterological Office
Characters played by Allen Glazner
Self - Geologist
University of North Carolina
Characters played by Ken Tankersley
Self - Anthropologist
University of Cincinnati
Characters played by Richard Young
Self - Geologist
State University of New York
Characters played by Anjana Khatwa
Self - Jurassic Expert
Characters played by Ken Hon
Self - University of Hawaii
Characters played by Andy Snyder
Self - U.S. Geological Survey
Characters played by Matthew Gorring
Self - Geologist
Montclair State University
Characters played by Jonathan O'Neil
Self - Geologist
McGill University
Characters played by Dirk Hellwig
Self - Structural Gelogist
Characters played by Nick Drake
Self - Geologist
King's College London
Characters played by Richard Waitt
Self - Geologist
U.S. Geological Survey
Characters played by Rowan Whittle
Self - Paleontologist
British Antarctic Survey
Characters played by Peter Haeussler
Self - U.S. Geological Survey
Characters played by Stephanie Ingle
Self - Volcanologist
University of Southampton
Characters played by John Marma
Self - Geologist
Newmont Mining Corporation
Characters played by James White
Self - Geological Sciences
University of Colorado
Characters played by John Caskey
Self - Geologist
San Francisco State University
Characters played by Kerry Sieh
Self - Geologist
Earth Observatory of Singapore
Characters played by Don Walsh
Self - Trieste Pilot
Characters played by Carolyn Shoemaker
Self - Astronomer
Lowell Observatory
Characters played by Carmen Solana
Self - Volcanologist
Portsmouth University
Characters played by Henrietta Cathey
Self - Geologist
University of Utah
Characters played by Chuck Blay
Self - The Edge of Kauai Investigations
Characters played by Emilie Thomassot
Self - Geologist
McGill University
Characters played by Laura Evenstar
Self - Geologist
University of Aberdeen
Characters played by Fekri Hassan
Self - Geologist
Univ. College London
Characters played by Robert Mulvaney
Self - British Antarctic Survey
Characters played by Kathryn Goodenough
Self - British Geological Survey
Characters played by Sean Willett
Self - Geologist
Characters played by David Franzi
Self - Geologist
Plattsburgh State University
Characters played by Greg Stock
Park Ranger
Yosemite National Park Service
Self - Geologist
Characters played by Thorvaldur Thordarson
Self - Volcanologist
University of Edinburgh
Characters played by Joel Pederson
Self - Geologist
Utah State University
Characters played by Mark Zoback
Self - Geophysicist
Stanford University
Characters played by Christopher Farrar
Self - Hydro-Geologist
U.S. Geological Survey
Characters played by Dan Miller
Self - Geologist
U.S. Geological Survey
Characters played by Charlie Callagan
Self - Park Ranger
Death Valley National Park
Characters played by John Muntean
Self - Geologist
University of Nevada Reno
Characters played by Michael West
Self - University of Alaska
Fairbanks
Characters played by John Galetzka
Self - Geologist
Caltech
Characters played by Giovanni Orsi
Self - Volcanologist
The Vesuvius Observatory
Characters played by John Menzies
Self - Geologist
Brock University
Ontario
Characters played by Brian McArdell
Self - Geologist
Characters played by Yuri Fialko
Self - University of California
San Diego
Characters played by Dudley Foster
Self - Woods Hole Oceanographic Inst.
Characters played by Mark Boslough
Self - Physicist
Sandia National Laboratories
Characters played by Ryan Crow
Self - Geologist
University of New Mexico
Characters played by Simon Day
Self - Geologist
University College London
Characters played by Pete Nienow
Self - Univ. of Edinburgh
Characters played by Claudio Latorre
Self - Paleoecologist
Universidad Católica de Chile
Characters played by Gerard Fryer
Self - Pacific Tsunami Warning Centre
Characters played by Barbara Nash
Self - Geologist
University of Utah
Characters played by Nicholas K. Coch
Self - Queens College - CUNY
Characters played by Laura J. Crossey
Self - University of New Mexico
Characters played by Caroline Smith
Curator of Meteorites
The Natural History Museum
Characters played by Barry Voight
Self - Volcanologist
Penn State University
Characters played by Lewis Owen
Self - Geologist
University of Cincinnatti
Characters played by Bruce Rubidge
Self - Paleontologist
University of Witwatersrand
Characters played by Paula Messina
Self - Geologist
San Jose State University
Characters played by Wade Hodges
Self - Geologist
Nevada Exploration Inc.
Characters played by Brandon B. Curry
Self - Geologist
Illinois State Geological Survey
Characters played by Jennifer Reynolds
Self - University of Alaska
Characters played by Geoffrey Notkin
Self - Aerolite Meteorites
Characters played by Scott Gediman
Self - Park Ranger
Yosemite National Park Service
Characters played by Ares Rosakis
Self - Geophysicist
Graduate Aeronautical Laboritories
Caltech
Characters played by Alfonso F. Davila
Self - NASA Ames Research Center
Characters played by Terry Plank
Self - Lamont-Doherty Earth Observatory
Characters played by Frank Sansone
Self - University of Hawaii
Characters played by Cheryl Jaworowski
Geologist
Yellowstone National Park
Self - Park Ranger
Characters played by Janet Siefert
Self - Senior Security Fellow
Rice University
Characters played by Nano Leonardo Seeber
Self - Geologist
Columbia University
Characters played by Henry Halls
Self - Geologist
University of Toronto
Characters played by Brittany Brand
Self - Geologist
University of Washington
Characters played by Paul Wignall
Self - Geologist
Leeds University
Characters played by Kevin Helmle
Self - Marine Biologist
National Research Council
Characters played by Rex Flake
Self - Central Washington University
Characters played by Meenakshi Wadhwa
Self - Geologist
Arizona State University
Characters played by Bob Stern
Self - Geoscientist
University of Texas
Characters played by Robert Smith
Self - Geologist
University of Utah
Characters played by Larry Collins
Self - Urban Search & Rescue
L.A. County Fire Dept.
Characters played by Valerie Zimmer
Self - Geological Engineer
Univ. of California
Characters played by Adrian Pfiffner
Self - Geologist
Characters played by Jeff Beitz
Self - Manager
Georgian Bay Marina
Characters played by Tom Pierson
Self - Hydrologist
U.S. Geological Survey
Characters played by Lee Kump
Self - Geologist
Penn State University
Characters played by Bernhard Riegl
Self - Marine Geologist
National Coral Reef Institute
Characters played by Marcia McNutt
Self - Monterey Bay Aquarium Research Inst.
Characters played by Mike Clynne
Self - Geologist
U.S. Geological Survey
Characters played by Matthew Saltzman
Self - Geologist
Ohio State University
Characters played by Dennis Jenkins
Self - Archaeologist
University of Oregon
Characters played by Fred McLaughlin
Self - Wyoming State Geological Survey