Ключевые слова: background, beautiful, black, blue, butte, canyon, cliff, desert, ecology, eroded, erosion, formation, geologic, geological, geology, hard, landmark, landscape, layer, limestone, mineral, mountain, national, national park, natural, nature, nobody, outdoor, park, pattern, red, rock, rock formation, rocky, rough, sandstone, scenic, sediment, sedimentary, sedimentary rock, shape, sky, stone, sunrise, surface, texture, textured, tree, tropical, weathering,