america, american, amphitheater, arizona, beautiful, blue, canyon, cliff, colorado, colorful, desert, eroded, erosion, expedition, formation, geologic, geological strata, grand, high, horizon, landmark, landscape, mother point, mountains, national park, nature, orange, peak, prehistoric, range, red, river, rock, sand, scenic, sky, stones, sun, travel, united states, us, usa, vacation, view, warmth, wild