Ключевые слова: america, ancient, beautiful, falls, famous, flowing, formations, geology, geothermal, heat, hot, landmark, landscape, mammoth, mineral, national, natural, nature, old, orange, outdoors, park, popular, rock, scenic, springs, steam, stone, sulfur, terrace, thermal, tourist, travel, travertine, usa, volcanic, water, white, wilderness, wyoming, yellow, yellowstone,