| A | B |
|---|
| cause: You kicked your dog. | effect: Your dog will be mean |
| auction | where something is sold to the highest bidder |
| fossilized | when a burried animal becomes hard |
| catastrophe | when something horrible happens |
| triggered | caused |
| comet | made of dust, gas or ice in outer space |
| asteROid | large ROck in outer space |
| great dying | when almost all species died off |
| ice ages | caused by climate and when things got icy and froze |
| a cause of mass extinction | impact of comets or asteroids |
| 6th extinction | caused by humans and the least understood |
