Ключевые слова: big, career, coal, construction, copper, deep, digging, earth, ecology, engineering, environment, equipment, excavation, excavator, geology, gold, gravel, heavy, hole, industrial, industry, iron, land, landscape, large, machine, machinery, metal, mine, mineral, nature, open, ore, power, quarry, resources, road, rock, sand, sky, stone, surface, technology, transport, truck, vehicle, work, yellow,