Assertion: crude oil | /r/HasProperty | drilled
Facets:
value: offshore
type: LOCATION
value: from an oil platform
type: LOCATION
value: usually
type: DEGREE
Source sentences:
text: Oil is classified according to three main categories: the geographic location where it was drilled, its sulfur content, and its API gravity (a measure of density).
text: Although petroleum is usually drilled for, natural pools of petroleum can form like this.
text: Offshore, oil is drilled from an oil platform.