crustal

[kruhs-tl]
adjective
of or pertaining to a crust, as of the earth.

Origin:
1855–60; < Latin crūst(a) shell, crust + -al1

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crustal (ˈkrʌstəl)
 
adj
of or relating to the earth's crust

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
His team's computer models are based on the idea that the floor of the basin
  was pre-stressed by years of crustal deformation.
Crustal subduction, for example, does not occur at lake shores.
Its crest is a volcanic rift zone, where crustal plates spread apart and molten
  rock erupts to form new seafloor.
Those are somehow causes by crustal deformation, but the specific mechanism
  isn't understood yet.
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