Assertion: natural gas | /r/HasProperty | mined
Facets:
value: from beneath the earth’s surface
type: LOCATION
Source sentences:
text: Natural gas is colourless and odourless and when it is mined, it is transported large distances by underground high-pressure pipelines.
text: Natural gas is odorless when it is mined from beneath the Earth’s surface, with the smell being added later as a means of alerting people to leaks of the substance.