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Yellowstone's many rivers are busily at work cutting down through post-caldera rhyolites throughout the park. Here the Firehole River (downstream from the famous hydrothermal areas) has cut a deep gorge in obsidian-rich rhyolites.
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George R. Brown School of Engineering: engr.rice.edu/about.cfm
As always, viewing this in Google Earth via the link to the left is most memorable.
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