Ключевые слова: america, barren, big, canyon, career, carrier, clearance, cobblestone, construction, conveyor, deep, drought, dust, earth, environment, eroding, excavation, extraction, factory, fossil, geology, giant, granite, gravel, ground, illegal, industry, iron, labor, limestone, logistic, material, metallurgy, mill, mineral, mining, mover, natural resource, openpit mining, pebble, processing, production, quarry, rock, sand, sandstone, save, stone, truck,