Across
- 2. layers of rock
- 6. the assumption of the age in years of a rock layer
- 7. remains of animals that have been hardened over time
- 8. When a fault or dike cuts through layers of rock
- 9. the amount of time it takes for half of an isotope to decay
- 10. a method used to date materials that aren't that geologically old
Down
- 1. gives age in actual years of a rock layer
- 3. younger rocks on top older on bottom
- 4. fossils that are useful for dating and correlating a strata
- 5. the older of 2 rocks is in the middle