Ключевые слова: ancient, arizona, badlands, blue, canyon, colorful, crystal, desert, dirt, earth, erosion, extinct, forest, formation, fossil, geological, geology, ground, hill, landscape, national, national park, natural, nature, orange, painted, paleozoic, park, period, petrified, petrified forest, petrified forest national park, petrified wood, preserve, purple, red, rock, sandstone, scenery, southwest, states, terrain, tree, trees, united, usa, valley, west, wilderness, wood,