Extinction is a normal part of the evolutionary process, but at certain times in Earth’s history the rate of extinction has greatly exceeded that of normal, or background, species loss. Scientists have identified five such events. What caused these five big mass extinction events? What did they have in common and how did they differ? And are we headed for a sixth one?
Explore the answers to these questions in this data-rich poster for the classroom.
(This poster is designed to be printed at a maximum size of 29.5" x 23.5".)
