Ключевые слова: background, blue, building, business, cement, clouds, concrete, construction, digging, dirty, environment, equipment, extraction, factory, geology, granite, gravel, grey, heap, heavy, industrial, industry, landscape, macadam, machine, machinery, material, mine, mineral, mining, mountain, nature, ore, outdoor, panorama, pebble, pile, pit, plant, quarry, rock, rough, sand, sky, stack, stone, technology, transport, transportation, white,