P.G. ADAM, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY P.G. ADAM, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Volcanic crater. Ubehebe volcanic crater, Death Valley National Park, California, USA. This crater, over 800 metres wide and 240 metres deep, was created by the eruption of the Ubehebe volcano three thousand years ago. Bedded layers of pyro- clastic rock (brown), the rock formed by the solid deposits released during a volcanic eruption, can be seen topped by volcanic ash (grey).
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