168k views
3 votes
When geologists refer to the Big Five what are they referring to?

User Sarcastron
by
8.1k points

2 Answers

4 votes
They're are reffering to a rapid decrease in the biodiversity on earth. ---> Extinction event
User Nevets
by
7.9k points
3 votes

the five largest mass extinctions in earths history

User Jared M
by
8.5k points