altitude canada destination direction downhill forest height high hiking lake landscape mountain path Rockies snow sunlight track trail travel Trek America blue boulders colorado daytime Denver erosion Fountain Formation geology geology Morrison nature outcrop outdoors park Red Rocks red rocks park red sandstone rock rocky Rocky Mountains sandstone scenic sky usa crassulaceae flower green meadow montane natural pink Queen's Crown Rhodiola rhodantha wild conifer evergreen Morning range remote shadow tree Alice Springs ancient Australia brown bush central Australia desert-country desert-region dry hill hills historic hot inland mountainous mountains outback ridge rocks rough rugged scrub shrubbery sunshine terrain textures trees