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Boulder - Wikipedia, the free encyclopedia
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Boulder
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This article is about the large rocks. For other uses, see
Boulder (disambiguation).
This article does not
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references or sources. Please help
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challenged and
removed. (December 2009)
This balancing boulder, "Balanced Rock" stands in
Garden of the Gods park in
Colorado Springs, Colorado, United States.
Boulder in beach sediments on
Saaremaa, Estonia. Glacial erratics such as this boulder are common on Baltic beaches.
In
geology, a boulder is a
rock with
grain size of usually no less than 256 mm (10 inches) diameter. While a boulder may be small enough to move or roll manually, others are extremely massive. In common usage, a boulder is too large for a person to move. Smaller boulders are usually just called
rocks or
stones. The word boulder comes from
Middle English "bulder" which was probably of
Scandinavian origin such as dialectal
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