Ключевые слова: aerial, america, architecture, arizona, boulder, building, built, canyon, colorado, concrete, construction, dam, desert, electricity, energy, engineering, environment, famous, generator, highway, historic, history, hydro, hydroelectric, industrial, industry, lake, landmark, landscape, leisure, mead, mountain, nevada, plant, pollution, power, recreation, reservoir, river, rock, structure, technology, tourism, tower, toxic, tranformer, usa, vacations, water,