Assertion: crude oil | /r/CapableOf | become since mid-1950
Facets:
value: due to its high energy density
type: CAUSE
value: due to relative abundance
type: CAUSE
value: due to easy transportability
type: CAUSE
Source sentences:
text: Due to its high energy density, easy transportability and relative abundance, oil has become the world's most important source of energy since the mid-1950s.