Assertion: mass extinction | /r/Synonym | sixth extinction
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: In addition to the five major mass extinctions, there are numerous minor ones as well, and the ongoing mass extinction caused by human activity is sometimes called the sixth extinction.
text: In addition to the five major mass extinctions, there are numerous minor ones as well, and the ongoing mass extinction caused by human activity is sometimes called the sixth extinction.