Assertion: cave | /r/HasProperty | natural void
Facets:
value: in the ground
type: LOCATION
value: by one popular definition
type: OTHER
Source sentences:
text: A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter.
text: By one popular definition, a cave is a natural void in the ground, or in a glacier, that's large enough for a person to enter and also contains areas that never see direct sunlight.