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Cliff face of welded tuff pockmarked with holes — some natural, some man-made from Bandelier National Monument, New Mexico
Cliff face of welded tuff pockmarked with holes — some natural, some man-made from Bandelier National Monument, New Mexico
Etruscan tuff blocks from a tomb at Banditaccia
Etruscan tuff blocks from a tomb at Banditaccia
A house constructed of tuff blocks in Germany
A house constructed of tuff blocks in Germany
Light-microscope image of tuff as seen in thin section (long dimension is several mm): The curved shapes of altered glass shards (ash fragments) are w
Light-microscope image of tuff as seen in thin section (long dimension is several mm): The curved shapes of altered glass shards (ash fragments) are well preserved, although the glass is partly altered. The shapes were formed about bubbles of expanding, water-rich gas.
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The Grand Canyon, an incision through layers of sedimentary rocks.
The Grand Canyon, an incision through layers of sedimentary rocks.
A balancing rock called Kummakivi (literally "strange stone")
A balancing rock called Kummakivi (literally "strange stone")
Rock outcrop along a mountain creek near Orosí, Costa Rica.
Rock outcrop along a mountain creek near Orosí, Costa Rica.
Sample of igneous gabbro
Sample of igneous gabbro