Ключевые слова: background, blue, building, business, career, cement, construction, crushed, day, destruction, development, earth, equipment, geology, granite, gravel, gray, ground, heap, heavy, industrial, industry, large, macadam, material, mine, mineral, mound, nature, outdoors, pebble, pit, pits, quarry, raw, resource, road, rock, rough, rubble, sand, sky, solid, stone, summer, technology, work, yellow,