Ключевые слова: activity, aggregate, background, belt, blue, business, cement, construction, conveyor, crushed, crusher, crushing, earth, environment, equipment, excavation, excavator, factory, gravel, heap, heavy, industrial, industry, large, machine, machinery, manufacturing, material, mine, mineral, mining, mountain, open, outdoors, pit, plant, processing, quarry, rock, sand, shovel, site, sky, stack, steel, stone, transport, transportation, truck, work,