Ключевые слова: abstract, ancient, backgrounds, bare, bottom view, canyon, cliff, climate change, concepts, day, desert, dirt, dramatic, dry, earth, environment, erode, fade, geology, gorge, grand, grand canyon, landscape, layer, life, low angle view, mountain, nature, no people, pass, pattern, primitive, ravine, red, rock, sand, sandstone, sedimentary, shadow, shape, sky, steep, stone, sun, surface, texture, valley, view, wall, world environment day,