boulder
Sign in to savethumb|This Balancing rock|balancing boulder, "[[Balanced Rock", stands in Garden of the Gods park in Colorado Springs, Colorado, United States.]] thumb|Boulder in British Columbia, Canada thumb|Kämmenkivi stone on the Pisa hill in Kuopio, Finland thumb|Balanced granite boulders at Hyderabad, India In geology, a boulder is a rock fragment with size greater than in diameter. Smaller pieces are called cobbles and pebbles. 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 us
Article
5 sectionsContents
- Etymology
- About
- See also
- References
- External links
thumb|This Balancing rock|balancing boulder, "[[Balanced Rock", stands in Garden of the Gods park in Colorado Springs, Colorado, United States.]] thumb|Boulder in British Columbia, Canada thumb|Kämmenkivi stone on the Pisa hill in Kuopio, Finland thumb|Balanced granite boulders at Hyderabad, India In geology, a boulder is a rock fragment with size greater than in diameter. Smaller pieces are called cobbles and pebbles. 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.
== Etymology == The word boulder derives from boulder stone, from Middle English bulderston or Swedish bullersten. It was previously sometimes spelled bowlder, which survives as a less common variant spelling.