18:25
How did the Grand Canyon form? What is its history?
11:31
When a Billion Years Disappeared
12:25
The Sun is NOT the Center of the Solar System
11:20
We Drove to the Bottom of the Grand Canyon and the Colorado River
13:50
The Unbelievable Story of Earth’s Most Epic Flood
16:13
Why Useless Knowledge Can Be So Useful
43:36
How Geologists Discovered and Mapped a Great Seaway
21:51