Ключевые слова: abstract, america, background, ball, blue, business, cartography, city, colorful, communication, concept, conservation, continent, crystal, design, development, earth, eco, ecology, energy, environment, environmental, europe, geography, glass, global, globe, grass, green, leaf, light, map, nature, night, planet, protection, reflection, save, science, sky, space, sphere, sun, sunlight, symbol, technology, travel, usa, world,