Ключевые слова: area, background, blue, calcite, calcium, carbonate, chalk, chalk hills, chalk mountains, chalky, construction, cretaceous, deposit, dig, earth, ecology, environment, excavate, excavation, excursion, geological, geology, grass, ground, hill, industrial, industry, land, landscape, lime, limepit, limestone, mine, mineral, natural, nature, opencast, outcrop, outcrops, rock, sedimentary, site, sky, stone, stony, surface, texture, travel, ukraine, white,