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Volcanoes!. Volcanoes – Global Distribution. Yellowstone and Calderas. Caldera formation. Shield vs. Stratovolcanoes. Stratovolcanoes. Stratovolcanoes. Tephra (welded ash) layers at Usu volcano in Japan. Tephra and lava layers at Crater lake in California. Mt St. Helens – May 1980.
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Yellowstone and Calderas Caldera formation
Stratovolcanoes Tephra (welded ash) layers at Usu volcano in Japan Tephra and lava layers at Crater lake in California
Mt. St. Helens VolcanoCam http://www.fs.fed.us/gpnf/volcanocams/msh/
Lava Flows - Hawaii pahoehoe lava
Lava Flows - Hawaii aa lava http://hvo.wr.usgs.gov/gallery/kilauea/volcanomovies/
Lava Flows – Newberry Caldera, Oregon Obsidian Flow - 1300 years old