Ключевые слова: american, arizona, beauty, blue, boulder, bridge, canyon, climate, colorful, construction, dam, desert, dry, energy, engineering, environment, exploration, extreme, generator, geology, heat, hill, historic, hoover, industry, lake, landscape, machine, mountain, national, nature, nevada, orange, outdoors, plant, power, reservoir, river, rock, scenic, states, stone, structure, temperature, tourism, tower, travel, turbine, united, view, water,