When you head out to Moab to visit National Parks, you are going to see lots of arches. This is one of the world's best locations for the formation of arches. The inland sea came in and evaporated numerous times over the millennium when the world was hotter and wetter than it is now, especially in what is now our American west. Salt domes would form and then evaporate leaving the rock formations behind. As a result, places like Arches National Park and sister parks like Canyonlands and Capitol Reef have a lot of arch formations and other features created by water in what is now this very high and dry desert plateau. These are some of the arches we saw on the trip, including Delicate Arch, which is one of the world's only free-standing arches, seen in the middle shot on the bottom row. Quite amazing to imagine that the whole ridge was one huge rock formation and it has all eroded away, except for the our aptly names Delicate Arch. Very unusual.
