Assertion: volcano's vent | /r/HasProperty | constant
Facets:
value: previously
type: TEMPORAL
value: hardly
type: DEGREE
Source sentences:
text: Yet these vents are unpredictable and hardly constant.
text: The new vents are no exception.
text: Pele's Vents," an area on the southern side, previously considered stable, collapsed completely into a giant pit, renamed "Pele's Pit".