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Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Craton
is always a great word to know.
So is core. Does it mean:
| outer layer of the earth, about 22 miles deep under the continents and 6 miles deep under the oceans |
| central portion of the earth believed to be composed mainly of iron and nickel in a molten state |
Collins
World English Dictionary
| craton (ˈkreɪtən) | |
| —n | |
| geology See shield a stable part of the earth's continental crust or lithosphere that has not been deformed significantly for many millions, even hundreds of millions, of years | |
| [C20: from Greek kratos strength] | |
| cratonic | |
| —adj | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
craton  (krā'tŏn') Pronunciation Key
A large portion of a continental plate that has been relatively undisturbed since the Precambrian era and includes both shield and platform layers. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia
craton
the stable interior portion of a continent characteristically composed of ancient crystalline basement rock. The term craton is used to distinguish such regions from mobile geosynclinal troughs, which are linear belts of sediment accumulations subject to subsidence (i.e., downwarping). The extensive central cratons of continents may consist of both shields and platforms. A shield is that part of a craton in which (usually) Precambrian basement rocks crop out extensively at the surface. By contrast, in a platform the basement is overlain by horizontal or subhorizontal sediments.
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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