Ключевые слова: background, belt, blue, business, cement, construction, conveyor, crushing, design, dig, dirt, earth, engineering, equipment, excavator, factory, gravel, ground, heap, heavy, hill, industrial, industry, machine, machinery, manufacturing, material, mine, mineral, mining, oil, open, outdoors, pebble, pit, plant, processing, quarry, rock, sand, sky, sorting, stack, steel, stone, transportation, truck, view, white, work,