Across
- 2. is alive for the longest time
- 5. are newer rocks on top of older rocks
- 6. the time it takes for an isotope to decay
- 7. is a chemical element
- 8. for dating and correlating the strata in which it is found.
- 10. a type of electrolyte
Down
- 1. starts with an assumption
- 3. is alive for the shortest time
- 4. is age in actual years
- 9. is a remnant of an animal or plant