Ключевые слова: america, arizona, calm, calmness, canyon, erosion, exteriors, geological formation, geology, gorge, grand canyon, grand canyon national park, grand canyon np, landscape, national park, natural, nature, north america, np, outdoors, outside, peaceful, peacefulness, quiet, quietness, rock formation, scenery, scenic, silence, southwest, southwestern, tranquil, tranquility, travel, traveling, unesco, united states, united states of america, usa, world heritage, world locations, world travel,