Question

The Cretaceous-Tertiary extinction, the most famous of the Big Five, has been attributed to what major event(s) that triggered the extinction of the dinosaurs?

Answer 1

From a thin layer of sediment known as the K-Pg boundary that could be found all over the world, the Cretaceous-Tertiary extinction event is believed to have been caused by a comet or meteor impact.

Answer 2

In your passage, you should be able to find this text:

"A summary of possible causes for the Cretaceous-Tertiary extinction is:

- an asteroid hitting the earth

- volcanism"