Ключевые слова: backhoe, big, building, bulldozer, business, cliff, construction, dig, dirt, dust, earth, ecology, engineering, environment, equipment, excavation, exploration, extraction, factory, geology, granite, gravel, ground, heavy, industry, landscape, large, limestone, machine, marble, material, mine, mineral, mining, nature, open, ore, outdoor, pit, production, quarry, rock, sand, stone, technology, transportation, truck, vehicle, work, yellow,