Assertion: natural gas | /r/HasProperty | liquefied
Facets:
value: by cooling it
type: MANNER
Source sentences:
text: Natural gas is liquefied by cooling it and removing most of the compounds in it other than methane.
text: Also, it is expensive for international transport since natural gas has to be liquefied before transported.
text: Natural gas can also be liquefied and shipped overseas, but this process is complex and expensive.