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.
Dictionary entry overview: What does arch mean? â¢ ARCH (noun) The noun ARCH has 4 senses: 1. a curved shape in the vertical plane that spans an opening 2. a curved bony structure supporting or enclosing organs (especially the inner sides of the feet) 3. a passageway under a curved masonry construction 4.