Assertion: crude oil | /r/HasProperty | primordial material
Facets:
Source sentences:
text: That hypoth esis has been replaced during the past forty years by the modern Russian-Ukrainian theory of abyssal, abiotic petroleum origins which has established that petroleum is a primordial material erupted from great depth.
text: He also wrote: "Petroleum ... [seems to be] a primordial hydrocarbon mixture into which bio-products have been added.