A great mass of hardened lava at the Big Obsidian Flow in Newberry National Volcanic Monument in Central Oregon on a sunny fall day.

A great mass of hardened lava at the Big Obsidian Flow in Newberry National Volcanic Monument in Central Oregon on a sunny fall day.

Photo by hddatmyers

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Stock photo: A great mass of hardened lava at the Big Obsidian Flow in Newberry National Volcanic Monument in Central Oregon on a sunny fall day. was taken by hddatmyers .