Across
- 3. The last Ice Age
- 6. Began 66 million years ago
- 9. Began 570 million years ago
- 11. Birds and snakes appeared
- 12. Dinosaurs went extinct
- 13. Rapid development of organisms
Down
- 1. Earliest time
- 2. Ginormous insects
- 4. Pangea split apart
- 5. Dinosaurs first appeared
- 7. Present day
- 8. Life originated during this time
- 10. Moon formed during this time