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10:45pm August 16, 2013

odditiesoflife:

Six Beautifully Formed Natural Bridges

A natural bridge, also called a natural arch, is formed by erosion that occurs in massive, horizontally bedded sandstone or limestone. Some bridges, such as the Natural Bridge near Lexington, Virginia (picture 2) are formed by the collapse of a cavern’s roof that may leave remnant portions as bridges. Others may be produced by entrenched rivers eroding through meander necks to form cutoffs. Still others are produced by exfoliation and may be enlarged by wind erosion. Superb examples can be found at Rainbow Bridge National Monument (picture 3) and the Natural Bridges National Monument (picture 6), both in Utah.

sources 1, 2, 3, 4, 5, 6, 7

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