chalk mountain nature park don, volgograd region

barrow bed beds bias blue chalk cliff cliffs cloud coomb crag cretaceous decline declivity descent don downhill downs erosion fall flank geology grass hang heap hillside inclination incline land landscape lowlands mountain mountainside mountl nature park paysage peak picture pile rake ravine region ridge russia russian scape scar scene scenery shelving side sky slant slope soil talus valley versant vesture view volgograd weathering weed whitening whiting