Ключевые слова: america, american, black, black canyon, black canyon of the gunnison national park, canyon, co, colorado, eroded, erosion, geology, gneiss, gorge, gunnison, hiking, landmark, landscape, mountain, mountains, national, national park, natural, nature, north america, park, precambrian, river, rock, scenic, schist, stone, tourism, trail, travel, united states, us, usa, valley, view,