Ключевые слова: big, blue sky, coal, coal mine, conveyor belt, copy space, digger, digging, dirt, dirty, energy, engineering, environment, equipment, excavation, excavator, exploitation, fossil, fossil fuel, geology, giant, heavy industry, huge, industrial, landscape, large, machine, machinery, mine, mining, nature, opencast, operations, outdoors, pit mine, place of work, power, production, quarry, quarrying,