Ключевые слова: activity, big, cement, deep, digging, dump, earth, environment, equipment, excavation, excavator, exploration, extraction, extreme, factory, geology, gray, grunge, heavy, huge, industrial, industry, large, limestone, limestone quarry, machine, machinery, machinery industry, metallic, mine, mineral, mining, open, open pit, pit, quarry, quarrying, rock, stone, technology, tool, transport, transportation, work,