Ключевые слова: america, beautiful, canyon, ecosystem, environment, famous, forest, geothermal, grand canyon, grass, green, heat, hiking, hot, hot spring, lake, landscape, montana, morning, national, national park, national park service, natural, nature, outdoor, outdoors, park, prismatic, river, rock, scenery, scenic, sky, spring, steam, summer, thermal, tourism, travel, tree, unites states, usa, volcanic, volcano, water, waterfall, wyoming, yellowstone, yellowstone falls, yellowstone national park,