geosynclinal

ge·o·syn·cli·nal

[jee-oh-sin-klahyn-l]
adjective
Geology. pertaining to a synclinal fold that involves a relatively large part of the earth's surface.

Origin:
1870–75; geo- + synclinal

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World English Dictionary
geosyncline (ˌdʒiːəʊˈsɪŋklaɪn) [Click for IPA pronunciation guide]
 
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
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00:10
Geosynclinal is always a great word to know.
So is erosion. Does it mean:
to dissolve out soluble constituents from ashes and soil by percolation
process where the surface of the earth is worn away by the action of water, glaciers, winds, waves
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