Assertion: planet's core | /r/HasProperty | iron
Facets:
value: mostly
type: DEGREE
Source sentences:
text: All terrestrial planets have approximately the same type of structure: a central metallic core composed of mostly iron, with a surrounding silicate mantle.
text: At present, the core is thought to be comprised of two separate layers— inner core composed of solid nickel and iron, and an outer core composed of molten nickel and iron.
text: At present, the core is thought to be comprised of two separate layers— inner core composed of solid nickel and iron, and an outer core composed of molten nickel and iron.