Assertion: asteroid belt's asteroid | /r/HasProperty | iron-nickel
Facets:
Source sentences:
text: M-type (metal-rich) asteroids form about 10% of the total population and are composed of iron-nickel and some silicate compounds.
text: M-type (metal-rich) asteroids form about 10% of the total population, and are composed of iron-nickel and some silicate compounds.