Assertion: natural gas | /r/HasProperty | a fossil energy source
Facets:
value: like coal
type: OTHER
value: like oil
type: OTHER
value: due to this property
type: CAUSE
Source sentences:
text: Natural gas is a fossil energy source that formed deep beneath the earth's surface.
text: Due to this property of producing less pollution compared to coal and oil, natural gas is considered the fossil energy source that will successfully replace coal and oil as the main energy source on the planet in the following decades.
text: Natural gas is a fossil energy source, just like coal or oil.