Assertion: mantle | /r/HasProperty | silicate rocks
Facets:
value: mostly
type: DEGREE
Source sentences:
text: The mantle is composed of silicate rocks that are rich in iron and magnesium relative to the overlying crust.
text: It is composed mostly of silicate rocks rich in magnesium and iron.
text: The mantle is composed of silicate rocks that are rich in iron and magnesium relative to the overlying crust.