Broken Arch, Arches National Park, Moab. Copyright © Fikret Onal. Image used under Creative Commons 2.0 License.

Arches National Park is 76,679 acres and located in eastern Utah just outside Moab.  It is known for preserving over 2000 natural sandstone arches, including the world-famous Delicate Arch, in addition to a variety of unique geological resources and formations.  Forty-three arches have collapsed due to erosion since 1970.  The park receives an average of 10 inches of rain per year.  The park lies atop an underground evaporite layer or salt bed, which is the main cause of the formation of the arches, spires, balanced rocks, sandstone fins, and eroded monoliths in the area.  (Source: Wikipedia, Image: Fikret Onal)

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