What are examples of mass extinctions?

Answer:
The K-T extinction; commonly known as the extinction that wiped out the dinosaurs. It was thought to be brought on by an asteroid impact.

The Permian Extinction; which was thought to be brought on by large, yet sudden, amounts of global volcanic activity.

The Ordovician extinction; This extinction is study very little, and there is no official cause.
First answer by Paleo Ottawa. Last edit by Paleo Ottawa. Contributor trust: 2 [recommend contributor recommended]. Question popularity: 1 [recommend question].