Assertion: crude oil | /r/CapableOf | become valuable
Facets:
value: in the 1850s
type: TEMPORAL
value: very
type: DEGREE
Source sentences:
text: Crude oil became very valuable in the 1850s, when it was discovered that it could be distilled to produce kerosene.
text: Crude oil became very valuable in the 1850s, when it was discovered that it could be distilled to produce kerosene.