Ключевые слова: background, blue, broken stone, bulk, business, cement, construction, constructions, conveyor, crusher, crushing, dirty, dust, ecology, environment, equipment, excavation, factory, fraction, gravel, heavy, industrial, industry, landscape, limestone, line, machine, machinery, manufacturing, mine, mining, nobody, opencast, outdoor, plant, pollution, processing, production, quarry, quarrying, raw, resources, rock, sky, smog, stone, technology, work, working, yellow,