Ключевые слова: activity, big, blue, built, bulldozer, business, coal, cobblestone, construction, conveyor, day, dirt, dust, earth, energy, environment, equipment, excavation, excavator, exploitation, fossil, fuel, gravel, heavy, hydraulic, industrial, industry, iron, machine, machinery, manufacturing, metal, mine, mineral, outdoors, part, pit, plant, power, production, quarry, rock, sand, scoop, shovel, sky, soil, technology, wide, work,