Ключевые слова: coal, concrete, construction, conveyor, crater, deep, digging, dump, earth, ecology, equipment, excavator, extraction, factory, fossil, geology, gravel, haul, heavy, hole, huge, industry, land, large, loading, machinery, manufacturing, material, metal, metallurgy, mine, mineral, mining, mountain, mover, open, ore, pit, processing, production, quarry, resource, rock, site, soil, stone, strip, transportation, truck, vehicle,