Rock Identification with Willsey: Volcanic Rocks (Tuff, Obsidian, Pumice)
28:01
Rock Identification with Willsey: Intro to Sedimentary Rocks!
24:25
Rock Identification with Willsey: BASALT and its many varieties
18:23
Rock Identification with Willsey: Volcanic Rocks (andesite, dacite, rhyolite)
39:46
Knapping Obsidian
13:45
All About Fire Obsidian & More Amazing Natural Glass!
21:41
Rock Identification with Willsey: Foliated Metamorphic Rocks - Slate, Phyllite, Schist, and Gneiss
39:10
Explore Numerous Layers of Petrified Trees: Yellowstone National Park
26:24