Across
- 4. Rock at bottom=old Top=New
- 5. when all of one thing dies and that thing is no more
- 8. The age of the fossil in years
- 10. Only lived for a short amount of time
- 12. The age based on the rocks around the one you're looking at
Down
- 1. study fossils
- 2. Study rocks
- 3. the surface where new rock meets old
- 6. A break in the earths crust
- 7. where fossils are found
- 9. Looks like a cockroach and Is also an index fossil
- 11. Very old rocks that had a life