Assertion: lava cave | /r/CapableOf | form at same time
Facets:
value: as the rock around them
type: OTHER
value: as the surrounding rock
type: OTHER
Source sentences:
text: lava caves are also called primary caves because they form at the same time as the surrounding rock.
text: Primary or lava caves form at the same time as the rock around them, as a result of volcanic activity.