Global warming led to ancient mass extinction event, scientists say

Extinction | Definition, Causes & Examples

The 5 mass extinction events that shaped the history of Earth — and the 6th that's happening now

Mass extinction facts and information from National Geographic

SOLVED: List major events associated with each major Era Period List the 5 major mass extinctions which have occurred through geological time.

One million species risk extinction: draft UN report

Earth's sixth mass extinction event under way, scientists warn

‘Mass extinction’ with a million years of rain may have led to rise of dinosaurs