A coral reef is made of thin layers of calcium carbonate A coral reef is made of thin layers of calcium carbonate National Ocean Service National Oceanic and Atmospheric Administration U.S. Department of Commerce
Arches is located in northeastern Utah, near the city of Moab. The park is famous for over 2,000 natural stone arches and offers much to the outdoor traveler. There is a 40-mile paved loop tour of the park with numerous trailheads and outlooks.
An arch bridge is a type of architectural structure that relies on a curved, semi-circular shape for support. Most arches distribute weight equally and are an attractive option for bridges because they can span great distances without needing posts or other weight-bearing mechanisms to be sunk into the ground.