Assertion: lead | /r/AtLocation | the earth’s crust
Facets:
value: as a metal
type: MANNER
value: very rarely
type: DEGREE
Source sentences:
text: Lead is a naturally occurring toxic metal found in the Earth’s crust.
text: Lead is found very rarely in the earth's crust as a metal.
text: Lead (or Pb in the periodic table) is a naturally occurring heavy metal that is found in the Earth’s crust.