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In geology, a boulder is a large rock, greater than 256mm (10") in diameter (see grain size for standards in use). While a boulder may be small enough to move or roll manually, others are extremely massive. Some famous rock formations involve giant boulders exposed by erosion, for example the Devil's Marbles in Australia's Northern Territory.

Some people choose to climb larger-sized boulders for recreational purposes or as a method of training for mountaineering and free climbs. This practice is known as bouldering.

Towns

There several towns in America named Boulder or with boulder in their names. See

Boulder, Western Australia

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Topics: Bouldering, Boulder Colorado, Boulder County Colorado...

BoulderingBouldering is climbing without a rope on large boulders. Bouldering is a pursuit in its own right as well as being used for training by climbers — as pioneered by John Gill in the 1950s and 1960s. The term bouldering is also used for horizontal climbing,	BoulderIn geology, a boulder is a large rock, greater than 256mm (10") in diameter (see grain size for standards in use). While a boulder may be small enough to move or roll manually, others are extremely massive. Some famous rock formations involve giant boulde	Boulder, ColoradoBoulder (40n01, 105w16 MST) is a city located in Boulder County, Colorado, USA. As of the 2000 census, the city had a total population of 94,673. It is home to the University of Colorado at Boulder, the largest university in Colorado. It has an elevation
Boulder County, ColoradoBoulder County is a county located in the U. state of Colorado. As of 2000, the population is 291,288. The county seat is Boulder. Geography According to the U. Census Bureau, the county has a total area of 1,946 km² (751 mi²). 1,923 km² (742 mi²) of it i	Boulder Creek, CaliforniaBoulder Creek is a census-designated place located in Santa Cruz County, California. As of the 2000 census, the CDP had a total population of 4,081. Geography Boulder Creek is located at 37°7'53" North, 122°7'28" West (37. 131487, -122. According to the U	Boulder Hill, IllinoisBoulder Hill is a census-designated place located in Kendall County, Illinois. As of the 2000 census, the CDP had a total population of 8,169. Geography Boulder Hill is located at 41°42'38" North, 88°20'0" West (41. 710562, -88. According to the United St
Boulder, Montana	Boulder City, Nevada	Boulder, Utah
Boulder Junction, Wisconsin	Boulder Flats, Wyoming	Boulder, Wyoming
Boulder Dash	Bouldering mat	Boulder River (southwestern Montana)

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