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rift zone

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rift zone

–noun Geology.
a system of related, narrow structural depressions between parallel faults.

Origin:
1965–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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rift zone  
n.  A large area of the earth in which plates of the earth's crust are moving away from each other, forming an extensive system of fractures and faults.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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