Ключевые слова: big, bucket, bulldozer, construction, development, digger, digging, earth, ecology, engineering, environment, equipment, excavator, geology, gravel, heap, heavy, industrial, industry, land, landscape, large, limestone, loader, machine, material, metal, mine, mineral, mountain, nature, open, opencast, ore, pit, quarry, raw, resource, rock, sand, shovel, stone, surface, tractor, transportation, truck, vehicle, white, work, yellow,