Assertion: comet's flash | /r/HasProperty | caused meteor
Facets:
value: in that time period
type: TEMPORAL
value: by 1 to 10 m
type: OTHER
Source sentences:
text: He identified 300 flashes caused by 1 to 10 m (3 to 33 ft) meteors in that time period and estimated the rate of Tunguska-sized events as once in 400 years.