Across
- 2. killed dinosaurs 66 million years ago
- 5. evidence of past life
- 6. some dinosaurs survived
- 9. time it takes for 50% of radioactive element to change
- 10. when the saber tooth tiger lived
- 11. when trilobites lived
- 12. eras are broken into
- 13. time when there were no hard parts to turn to fossils
Down
- 1. oldest layer found here
- 3. paleozoic , cenozoic, mesozoic are examples
- 4. age where you put things in order
- 7. when dinosaurs lived
- 8. example of what could trap an original remains fossil
- 10. thing that cuts is younger than what it cuts