DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Volcanic tuff. Mountainside of black tuff or tuffstone, with remnants of snow cover. Tuff is formed by the deposition of ash from volcanic eruptions, which becomes consolidated into a solid rock. Photographed near the Vatnajokull glacier in eastern Iceland. The intense volcanic activity in this region is the consequence of the island's location on the boundary between the European and North American tectonic plates.
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