Ключевые слова: big, black, carbon, coal, construction, dig, dirt, dirty, dump, dust, earth, energy, engineering, environment, equipment, excavation, excavator, fossil, fuel, geology, gold, heavy, industrial, industry, iron, large, machine, machinery, metal, mine, mineral, mining, open, opencast, ore, pit, power, production, quarry, rock, soil, stone, surface, technology, transport, transportation, truck, work, yellow,