| Boulder |
Article Index for Boulder |
Limousines in Boulder |
Articles about Boulder |
Website Links For Boulder |
Information AboutBoulder |
|
park in Colorado Springs, CO ]] In Geology , a boulder is a Rock with Grain Size of usually no less than 256 Mm (10 Inch es) diameter. 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 . The word boulder comes from Middle English "''bulder''" which was probably of Scandinavian origin such as dialectal Swedish "''bullersten''" meaning "''noisy stone''" (Imagine a large stone in a stream, causing water to roar around it) from "''bullra''" (to roar, cf. Dutch "''bulderen''", with the same meaning) and "''steen''" (stone). In places covered by Ice Sheet s during Ice Age s, such as Scandinavia and Northern North America , ice has moved and formed granite boulders ( Glacial Erratic s). One of the largest is used as the pedestal of The Bronze Horseman in Saint Petersburg . Some famous rock formations involve giant boulders exposed by Erosion , such as the Devil's Marbles in Australia's Northern Territory , the Wairere Boulders in New Zealand, where boulders only form an entire valley, and The Baths on the island of Virgin Gorda in the British Virgin Islands . Bouldering is a sport that involves climbing on boulders. |
|
|