Assertion: sulfur dioxide | /r/HasProperty | prepared by the burning
Facets:
value: in oxygen
type: OTHER
value: usually
type: TEMPORAL
value: industrially
type: LOCATION
Source sentences:
text: Occurring in nature in volcanic gases and in solution in the waters of some warm springs, sulfur dioxide usually is prepared industrially by the burning in air or oxygen of sulfur or such compounds of sulfur as iron pyrite or copper pyrite.
text: Occurring in nature in volcanic gases and in solution in the waters of some warm springs, sulfur dioxide usually is prepared industrially by the burning in air or oxygen of sulfur or such compounds of sulfur as iron pyrite or copper pyrite.