big obsidian lava flow newberry volcanic national monument |
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| navigate by keyword : aerial agriculture ancient are attraction big black caldera central chunk colorful dense eruption flow forest formation geeologic geologic geology glass lake landscape large lava lave monument national nature newberry object obsidian oregon outdoor past paulina peak piece result rich rock shiny silicate sisters three tourism travel typical view visitor volcanic volcano |
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| Obsidian glass rock are typical from result of rich silicate lave flow |
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