Assertion: oceanic crust | /r/HasProperty | mafic rocks
Facets:
value: primarily
type: DEGREE
Source sentences:
text: Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium.
text: Oceanic crust is primarily composed of mafic rocks, or sima.
text: Oceanic crust is primarily composed of mafic rocks, or sima which is named for its magnesium silicate minerals.