Assertion: hydrogen | /r/HasProperty | combined with carbon
Facets:
value: through a process
type: MANNER
value: as in petroleum
type: OTHER
value: from carbon dioxide
type: OTHER
value: in fossil fuels
type: LOCATION
Source sentences:
text: In fossil fuels, it is combined with carbon as in petroleum, natural gas or coal.
text: Through a process called biomethanation, hydrogen is combined with the carbon from carbon dioxide.