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