Assertion: fossil cave | /r/HasAspect | a lot of rubble
Facets:
value: from roof collapse in them
type: LOCATION
value: often
type: TEMPORAL
Source sentences:
text: Fossil caves often have a lot of rubble from roof collapse in them because there is no water to dissolve or carry it away, and they are often characterised by calcite precipitation and the development of stalactites and stalagmites.