Volcanic rock outcrops along the wall of Grand Canyon of Yellowstone. Their yellowish color gave the Yellowstone National Park its name. Wyoming, USA

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Photo credit: © Gabbro / Alamy / Afripics
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Keywords: america, american, canyon, erosion, geology, grand, landscape, national, north, outcrops, park, rock, snow, states, tuff, united, usa, volcanic, wall, winter, wyoming, yellowstone