Assertion: lava tube | /r/HasProperty | efficient transporters of lava
Facets:
value: from the vent
type: LOCATION
value: very
type: DEGREE
Source sentences:
text: Lava tubes are very efficient transporters of lava from the vent to the flow front, and Laszlo Keszthelyi has recently calculated that lava flowing in a tube loses only about 1Cº of heat/kilometer.