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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Szoenyi, Michael |
Bildgröße: | 5125 px × 3417 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |