Ключевые слова: algae, america, basin, blue, boiling, color, colorful, destination, ecology, format, geology, geothermal, geyser, horizontal, hot, lake, landmark, landscape, national, natural, nature, outdoors, outside, park, pool, scene, scenery, scenic, spring, steam, surprise, thermal, travel, trees, usa, vacation, volcanic, water, wild, wilderness, wyoming, yellowstone,