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/ˈkɹʌstəl/ · adjective
Of, pertaining to, or forming a crust, especially the crust of the Earth or other planet..
The hope was to lower a drill through over 4,000 metres of Pacific Ocean water off the coast of Mexico and drill some 5,000 metres through relatively thin crustal rock.
Use crustal when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Crustal means Of, pertaining to, or forming a crust, especially the crust of the Earth or other planet..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The hope was to lower a drill through over 4,000 metres of Pacific Ocean water off the coast of Mexico and drill some 5,000 metres through relatively thin crustal rock.
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