What lies buried 20,000 feet under the Appalachian Mountains?
24:22
Why does Appalachia have so many mountains with coal under them?
20:34
Why does crude oil seep out of the ground on this beautiful Caribbean Island?
29:02
How did wrinkled rock layers form these incredible mountains?
26:11
Why is the Marianas Trench the deepest place on Planet Earth? A look beneath the ocean
15:08
How did an ancient geologic fault line form this 120 mile long valley?
33:08
How did an ancient meteor impact help America spread westward?
26:01
Surprising Implications of a Cave Discovery
36:55