Ключевые слова: activity, belt, blue, business, cobblestone, concrete, construction, conveyor, earth, electric, equipment, extraction, factory, granit, gravel, growth, heap, hill, industrial, industry, iron, large, machine, machinery, manufacturing, marble, material, metal, mine, mineral, motor, mountain, outdoors, pebble, plant, quarry, rock, rusty, sand, sky, stack, steel, stone, technology, transport, transportation, view, working,