geosyncline

[jee-oh-sin-klahyn]

ge·o·syn·cline

[jee-oh-sin-klahyn]
noun Geology.
a portion of the earth's crust subjected to downward warping during a large span of geologic time; a geosynclinal fold.

Origin:
1890–95; geo- + syncline
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Geosyncline is always a great word to know.
So is convergent plate boundary. Does it mean:
rich soil containing a relatively equal mixture of sand, silt and a smaller proportion of clay
tectonic boundary where two plates are moving toward each other
Collins
World English Dictionary
geosyncline (ˌdʒiːəʊˈsɪŋklaɪn)
 
n
a broad elongated depression in the earth's crust containing great thicknesses of sediment
 
geosyn'clinal
 
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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American Heritage
Science Dictionary
geosyncline   (jē'ō-sĭn'klīn')  Pronunciation Key 
A usually elongate, basinlike depression along the edge of a continent, in which a thick sequence of sediments and volcanic deposits has accumulated.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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