fault line

fault line

noun Geology.
the intersection of a fault with the surface of the earth or other plane of reference.

Origin:
1865–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Fault line is always a great word to know.
So is permeability. Does it mean:
capability of a porous rock or sediment to permit the flow of fluids through its pore spaces
single bed of sedimentary rock, consisting of one kind of matter representing continuous deposition
Collins
World English Dictionary
fault line
 
n
1.  geology Also called: fault plane the surface of a fault fracture along which the rocks have been displaced
2.  a potentially disruptive division or area of contention: Europe remains the main fault line in the Tory Party

Collins English Dictionary - Complete & Unabridged 10th Edition
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