Assertion: oxygen | /r/AtLocation | the atmosphere
Facets:
value: naturally
type: MANNER
value: as a stable molecule
type: MANNER
Source sentences:
text: Oxygen is a chemical element that exists in the atmosphere as a stable molecule containing two atoms (O 2 ).
text: Oxygen only began to persist in the atmosphere in small quantities about 50 million years before the start of the Great Oxygenation Event.
text: Oxygen is naturally found in the atmosphere.