Ключевые слова: adventure, background, beautiful, challenge, cliff, copy space, environment, evergreen tree, forest, grass, green, growing, hiking, hill, historic, landscape, lewis falls, moss, mountain, mountains, natural, nature, north america, outdoor, outdoors, outside, rock, rocky, shoreline, steep, stone, summer, tenacious, tourism, travel, tree, united states, usa, vacation, water, wood, yellowstone national park,