Ключевые слова: america, brown, calcium, colorful, environment, famous, geology, geothermal, geyser, hot, landmark, landscape, limestone, mammoth, mammoth hot springs, mineral, mountain, national, natural, nature, orange, outdoor, outdoors, park, pool, preserve, rock, scenery, scenic, spring, springs, steam, sulfur, summer, terrace, thermal, tourism, travel, travertine, usa, volcanic, water, waterfall, white, yellow, yellowstone, yellowstone national park,