
1) Part 2) Piece
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https://www.crosswordclues.com/clue/craton

A craton n (κράτος kratos `strength`) is an old and stable part of the continental lithosphere. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates. They are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedime.....
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http://en.wikipedia.org/wiki/Craton

old and stable part of the continental crust that has survived the merging and splitting of continents and supercontinents for at least 500 million years.
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http://en.wikipedia.org/wiki/Glossary_of_geology

the stable interior portion of a continent characteristically composed of ancient crystalline basement rock. The term craton is used to distinguish ... [6 related articles]
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http://www.britannica.com/eb/a-z/c/155

A large, and usually ancient, stable mass of the earth’s crust.
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http://www.encyclo.co.uk/local/21313

A part of the earth's crust that has attained stability and has been little deformed for a prolonged period.
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http://www.encyclo.co.uk/local/21455

The segment of the Earth's continents that have remained tectonically stable and relatively earthquake-free for a vast period of time. The craton is composed of the continental shield and the surrounding continental platform.
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http://www.encyclo.co.uk/local/22291

The stable continental crust, including the shield and stable platform areas, most of which have not been affected by significant tectonic activity since the close of the Precambrian era.
Found on
http://www.evcforum.net/WebPages/Glossary_Geology.html

A part of the earth's crust that has attained stability and has been little deformed for a prolonged period.
Found on
http://www.fossilmall.com/Science/Glossary.htm

Stable foundation core of the Earth's various plates of continental crust. Composed of the shield and platform.
Found on
http://www.physicalgeography.net/physgeoglos/c.html

A part of the Earth's crust that has attained stability and has been little deformed for a long period of time, refers only to continents; cratonic
Found on
http://www.scientificpsychic.com/etc/geology-glossary.html

n. A part of the Earth's crust that has attained stability and has been little deformed for a long period of time, refers only to continents; cratonic- adj.
Found on
http://www.ucmp.berkeley.edu/glossary/gloss2geol.html

n. A part of the Earth's crust that has attained stability and has been little deformed for a long period of time, refers only to continents; cratonic- adj.
Found on
http://www.ucmp.berkeley.edu/glossary/glossary_2.html

[
n] - the part of a continent that is stable and forms the central mass of the continent
Found on
http://www.webdictionary.co.uk/definition.php?query=craton

Area of the continental crust that has not been significantly deformed typically since Cambrian times. Cratons contain extensive crystalline basement rocks called shields.
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https://www.encyclo.co.uk/local/20501
noun the part of a continent that is stable and forms the central mass of the continent; typically Precambrian
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https://www.encyclo.co.uk/local/20974

The relatively stable core of a continent that is not currently affected by tectonics along plate boundaries. Cratons generally consist of highly deformed metamorphic rock that formed during ancient orogenic explosions. Cratons exist in the hearts of all the continents, a typical example being the Canadian Shield
Found on
https://www.encyclo.co.uk/local/21221

Portions of the earth's crust that have remained stable for at least 1,500 million years.
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https://www.encyclo.co.uk/local/22070

The stable portions of the continents that have escaped orogenic activity for the last 2 billion years. Made predominantly of granite and metamorphic rocks. compare orogen .
Found on
https://www.encyclo.co.uk/local/22327

a relatively rigid and immobile region of continental portions of the earth's crust.
Found on
https://www.infoplease.com/dictionary/craton
No exact match found.