Assertion: crude oil | /r/AtLocation | subsurface deposits
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Crude oil usually occurs in subsurface deposits, but in some areas it leaks onto the surface in oil seeps.
text: As a technical term, petroleum also includes natural gas, a naturally occurring gas with a similar chemistry to crude oil that also occurs in subsurface deposits.
text: Crude oil usually occurs in subsurface deposits, but in some areas it leaks onto the surface in oil seeps.
text: As a technical term, petroleum also includes natural gas, a naturally occurring gas with a similar chemistry to crude oil that also occurs in subsurface deposits.