Assertion: hydrogen fluoride's amount | /r/AtLocation | the air
Facets:
value: normally
type: DEGREE
value: naturally
type: MANNER
Source sentences:
text: In the air: Small amounts of fluoride are normally found in the air.
text: Small amount of fluorine is naturally present in the water, air, plants and animals.
text: In the air: Small amounts of fluoride are normally found in the air.