Assertion: ore's iron | /r/AtLocation | the surface of the earth
Facets:
value: rarely
type: DEGREE
Source sentences:
text: Metallic or native iron is rarely found on the surface of the Earth because it tends to oxidize.
text: The iron that was initially used as early as 4000 B.C. was called meteoric iron and was found on the surface of the earth, as this type of iron came from the meteorites that struck the earth before the humans appeared and was in very limited supply.