Boulder

The Balanced Rock "balances" in Garden of the Gods in Colorado Springs, Colorado, United States.

In geology, a boulder is a large piece of rock fragment that is larger than 25.6cm or roughly 10.1 inches in diameter or with a size value less than -8 on the φ particle size scale with no upper size limit.

Boulder Media

Boulder in British Columbia, Canada
Kämmenkivi stone on the Pisa hill in Kuopio, Finland

References

Webster’s New International Dictionary of the English Language. Springfield, Massachusetts: G. & C. Merriam Company. 1913.
"Boulder". Dictionary.com. Retrieved 24 August 2013.

Citations

"Boulder". Collins English Dictionary.

Other websites

Media related to Boulders at Wikimedia Commons

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