syncline

[sing-klahyn, sin-]

syn·cline

[sing-klahyn, sin-]
noun Geology.
a synclinal fold.

Origin:
1870–75; back formation from synclinal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Syncline is always a great word to know.
So is strata. Does it mean:
single bed of sedimentary rock, consisting of one kind of matter representing continuous deposition
portion of the earth's surface consisting of disintegrated rock and humus
Collins
World English Dictionary
syncline (ˈsɪŋklaɪn)
 
n
Compare anticline a downward fold of stratified rock in which the strata slope towards a vertical axis
 
[C19: from syn- + Greek klīnein to lean]
 
syn'clinal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
syncline   (sĭn'klīn')  Pronunciation Key 


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A fold of rock layers that slope upward on both sides of a common low point. Synclines form when rocks are compressed by plate-tectonic forces. They can be as small as the side of a cliff or as large as an entire valley. Compare anticline.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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