• 2 DVDs

• 5 Historical geology
• 5 History
• 4 Continental drift
• 3 Trenches
• 3 Volcanoes
• 2 Tsunamis
• 1 Asteroids
• 1 Collisions with Earth
• 1 Glacial epoch
• 1 Gold
• 1 Origin
• 1 Volcanism

• 4 Johnson, Corey, 1961-
• 3 Hicklin, William
• 2 Arts and Entertainment Network
• 2 History (Television network)
• 2 New Video Group
• 2 Pioneer Productions
• 1 Europe Images International
• 1 Films Media Group
• 1 Films for the Humanities & Sciences (Firm)
• 1 Johnson, Kathryn (Director)
• 1 Strange, Robert
• 1 Werbe, Susan

• 5 English

• 4 Earth (Planet)
• 2 San Andreas Fault (Calif.)
• 1 Alps
• 1 Atacama Desert (Chile)
• 1 Death Valley (Calif. and Nev.)
• 1 Everest, Mount (China and Nepal)
• 1 Grand Canyon (Ariz.)
• 1 Great Lakes (North America)
• 1 Hawaii
• 1 Iceland
• 1 Krakatoa (Indonesia)
• 1 Ness, Loch (Scotland)
• 1 New York (N.Y.)
• 1 North America
• 1 Oceania
• 1 Rocky Mountains
• 1 Sahara
• 1 Saint Helens, Mount (Wash.)
• 1 Vesuvius (Italy)
• 1 Yellowstone National Park
• 1 Yosemite National Park (Calif.)

• 4 Documentary television programs
• 2 Nature television programs
• 2 Nonfiction television programs
• 2 Science television programs
• 2 Television programs
• 2 Television series
• 2 Video recordings for the hearing impaired
• 1 Educational films
• 1 Internet videos
• 1 Videorecording

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