Ключевые слова: active, arizona, autumn, beautiful, blue, calm, canyon, clear, cliff, colorado, concept, deep, desert, distance, flow, geology, green, historic, horizontal, landscape, mountain, national, nature, outdoors, park, peaceful, plateau, range, red, reflection, river, rock, running, sandstone, scenery, scenic, serene, sky, smooth, stone, tourism, travel, tree, usa, valley, view, water,