Ключевые слова: big, chalk, coal, construction, digging, dump, earth, ecology, engineering, equipment, geology, gravel, heavy, industrial, industry, iron, landscape, large, limestone, load, machine, machinery, material, metal, mine, mineral, mining, mountain, nature, open, opencast, ore, pit, production, quarry, resource, road, rock, sand, site, soil, stone, technology, transport, transportation, truck, vehicle, work,