48:52

Nevada: America's True Golden State

1:01:28

A Brief Geologic History of Colorado

1:21:05

Mt St Helens, the 42nd Anniversary

1:11:55

Tales Told By Trilobites

1:18:31

Geology of Central Oregon

1:29:45

Grand Canyon: Young Canyon, Old Rocks (A journey through the geologic history of the Grand Canyon)

1:08:18

Tri-State Zinc-Lead District

2:08:03

Brian Greene and Leonard Susskind: Quantum Mechanics, Black Holes and String Theory