Assertion: crude oil | /r/Synonym | black gold
Facets:
value: because of its scarcity on the earth
type: CAUSE
value: usually
type: DEGREE
value: sometimes
type: TEMPORAL
value: in color
type: OTHER
Source sentences:
text: Crude oil is sometimes called "black gold" because of its scarcity on the Earth.
text: Crude oil is usually black or dark brown, but can also be yellowish, reddish, tan, or even greenish.
text: Bitumen is a form of petroleum that is black, extremely sticky, and sometimes rises to Earth’s surface.
text: Most petroleum is dark brown or blackish in color, but it also occurs in green, red, or yellow.
text: The extreme monetary value of oil and its products has led to it being known as "black gold".
text: Crude oil is sometimes called "black gold" because of its scarcity on the Earth.
text: Crude oil is usually black or dark brown, but can also be yellowish, reddish, tan, or even greenish.