Assertion: crust's layer | /r/RelatedTo | lower crust of gabbroic rocks
Facets:
Source sentences:
text: Through comparisons with ophiolites (sections of oceanic or oceanic-like crust exposed on land), exposures of faulted oceanic crust, and laboratory measurements of rock samples, a generalized view of crustal structure has emerged, where seismic layer 2 corresponds with the extrusive rocks and dikes of the upper crust, and where seismic layer 3 is associated with the lower crust of gabbroic rocks.