Boulder

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.

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

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

Citations
  1. "Boulder". Collins English Dictionary.

Other websites
  • Media related to Boulders at Wikimedia Commons
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