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- (1)
A natural (rock) arch is a rock exposure with a hole completely through it, created by the natural removal of some of the rock to leave an intact rock frame around the hole (Natural Arch and Bridge Society n.d.).
- (2)
A natural bridge is a natural arch that crosses a valley of erosion.
- (3)
A natural tunnel is a natural arch which has a width greater than three times its span (Synder 2011).
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References
Kolb K (2010) Small winding channel in Tartarus Colles. http://hirise.lpl.arizona.edu/PSP_001420_2045
Natural Arch and Bridge Society (n.d.) Frequently asked questions. http://www.naturalarches.org/archinfo/faq.htm
Robinson MS, Ashley JW, Boyd AK, Wagner RV, Speyerer EJ, Hawke BR, Hiesinger H, van der Bogert CH (2012) Confirmation of sublunarean voids and thin layering in mare deposits. Planet Space Sci 69(1):18–27
Synder TA (2011) Ohio’s natural arches. Educational leaflet 18. http://www.dnr.state.oh.us/Portals/10/pdf/EL/el18.pdf
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Hargitai, H. (2014). Rock Arch. In: Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9213-9_336-1
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DOI: https://doi.org/10.1007/978-1-4614-9213-9_336-1
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