Assertion: caldera | /r/CapableOf | form by the collapse of a 3,700 m
Facets:
value: during an enormous eruption
type: TEMPORAL
Source sentences:
text: Geologic History Crater Lake partially fills a type of volcanic depression called a caldera that formed by the collapse of a 3,700 m (12,000 ft) volcano known as Mount Mazama during an enormous eruption approximately 7,700 years ago.