Across
- 3. uses the principle of unforfmitarianism to learn about organisms
- 7. atoms of the same element
- 10. unstable element that changes into a stable element
- 11. putting rocks together from different locations
- 13. orga
- 14. age of rocks
- 15. where rocks eroded away
Down
- 1. numerical age of rocks or object
- 2. filled with stuff to keep the insides safe
- 4. the principle of rock layers
- 5. time for parent to decay into daughter
- 6. old rocks goes into new rock
- 7. species that existed for a short length of time
- 8. impression of last thing in there
- 9. things change fast one earth with violent event
- 12. dead remains of old animals