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extinction level event
subjectfact 
extinction level eventhas average interval time 100 million years2001-09-27 09:30:07.0
has definition impact event which can cause the extinction of many species on a planet2001-09-27 09:30:07.0
is a kind of impact event2001-09-27 09:30:07.0
impact eventcan produce a crater2001-09-27 09:30:06.0
eventhas duration2001-09-27 09:29:57.0
has synonym world point2001-09-27 09:29:57.0
has time of occurrence2001-09-27 09:29:57.0