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boulder

boulder large rock fragment formed by detachment from its parent consolidated rock by weathering and erosion. In engineering and geology, especially in the United States, the term is applied to loose rocks having specific sizes according to various systems of classification, i.e. the Wentworth scale (for C. K. Wentworth, American geologist), where a boulder has one linear dimension of at least 10.1 in. (25.4 cm). Boulders transported by glacial ice are usually referred to as glacial erratics; glacial boulder fields, or felsenmeer, containing large blocks of angular rock broken from intense frost action are evidence that the region has experienced glacial action in the past. See drift ; moraine .

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"boulder." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 29 Nov. 2009 <http://www.encyclopedia.com>.

"boulder." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (November 29, 2009). http://www.encyclopedia.com/doc/1E1-boulder.html

"boulder." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved November 29, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-boulder.html

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boulder

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

boulder See PARTICLE SIZE.

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AILSA ALLABY and MICHAEL ALLABY. "boulder." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 29 Nov. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "boulder." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (November 29, 2009). http://www.encyclopedia.com/doc/1O13-boulder.html

AILSA ALLABY and MICHAEL ALLABY. "boulder." A Dictionary of Earth Sciences. 1999. Retrieved November 29, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-boulder.html

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The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

boulder XIII. First as bulder ston, of Scand. orig.; Cf. Sw. dial. bullersten, buldurstajn; perh. orig. a stone that causes a rumbling noise in water (Cf. Sw. buller sb., bullra vb. rumble).

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T. F. HOAD. "boulder." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 29 Nov. 2009 <http://www.encyclopedia.com>.

T. F. HOAD. "boulder." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (November 29, 2009). http://www.encyclopedia.com/doc/1O27-boulder.html

T. F. HOAD. "boulder." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved November 29, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-boulder.html

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