Ключевые слова: big, black, carbon, coal, construction, dig, digger, digging, dirt, earth, energy, engineering, environment, equipment, excavation, excavator, fossil, fuel, geology, ground, heavy, huge, industrial, industry, iron, large, machine, machinery, metal, mine, miner, mineral, mining, mover, open, ore, pit, power, production, quarry, skirt, stone, technology, transport, transportation, truck, vehicle, wheel, work, yellow,