Ключевые слова: belt, business, chalk, construction, conveyor, crushed, crusher, crushers, curve, deep, earth, eath mover, ecology, engineering, environment, equipment, excavation, extracting, factory, geology, gravel, heap, heavy, land, landscape, machinery, manufacturing, material, metal, mine, mineral, mountain, open, open pit, opencast, pit, place, quarry, quarrying, road, rock, stone, stone crusher, surface, technology,