Ключевые слова: above, alternative, america, arch, arizona, boulder, bridge, canyon, colorado, concrete, construction, dam, day, desert, electric, electricity, energy, engineering, environment, famous, generation, generator, historic, hoover, hydro, hydroelectric, industry, lake, landmark, landscape, large, mountain, national, nature, nevada, outdoors, power, reservoir, river, rock, scenic, structure, supply, technology, top, tower, travel, usa, view, water,