Travertine formations at Grassy Spring, Upper Mammoth Terraces, Yellowstone National Park, Wyoming, USA.

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Photo credit: © Greg Vaughn / Alamy / Afripics
License: Royalty Free
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Keywords: america, american, calcium, carbonate, formations, geology, geothermal, grassy, gv19091176, hot, landscape, mammoth, minerals, national, nature, outdoors, park, parks, scenic, spring, springs, terrace, travel, travertine, upper, usa, west, western, wyoming, yellowstone