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Boulder: In geology, a boulder is a rock fragment with size greater than 256 millimetres in diameter. Smaller pieces are called cobbles and pebbles.
Boulder, Colorado: Boulder () is the home rule municipality, county seat, and the most populous municipality of Boulder County, Colorado, United States. Boulder is located at the base of the foothills of the Rocky Mountains at an elevation of 5,430 feet above sea level.
Bouldering: Bouldering is a form of rock climbing that is performed on small rock formations or artificial rock walls without the use of ropes or harnesses. While bouldering can be done without any equipment, most climbers use climbing shoes to help secure footholds, chalk to keep their hands dry and to provide a firmer grip, and bouldering mats to prevent injuries from falls.
Boulder City, Nevada: Boulder City is a city in Clark County, Nevada, United States. It is approximately 26 miles southeast of Las Vegas.