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50.1 MB (50.0 MB compressed)
5125 x 3417 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Obsidian flow. Close-up of a rock face made of obsidian. This pyroclastic material formed when a slow-moving, silica-rich lava flow cooled rapidly. It is also known as volcanic glass. Photographed in Newberry Volcanic National Monument, Oregon, USA.
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