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.
The Arch in the Town of Marshall, also known as Marshall Arch, is an arch spanning State Road 236 in downtown Marshall, Indiana, United States. The wooden arch has a span of ; it is supported by concrete piers and has a clearance of 17ft at its highest point.