Assertion: hemoglobin's oxygen | /r/HasProperty | the most abundant element
Facets:
value: on earth
type: LOCATION
value: in the earth's crust
type: LOCATION
value: by mass
type: OTHER
Source sentences:
text: Oxygen constitutes 49.2% of the Earth's crust by mass as part of oxide compounds such as silicon dioxide and is the most abundant element by mass in the Earth's crust.
text: Oxygen is the most widespread element on earth.