About: extinction level event

Premodifier: extinction level
Head noun: event

Same concepts
http://dbpedia.org/resource/Extinction_event

Broader concepts

label	provenance	confidence

Narrower concepts

label	provenance	confidence
asteroid impact	isap:123506469	0.714933
super volcano	isap:38768012	0.612553
fukushima	isap:15361257	0.338979