Across
- 2. any method of measuring the age of an event
- 4. long cylinder of ice
- 5. a method of determining the absolute age of an object geology
- 7. trace/remains of an organism
- 8. a break in the geologic record
- 10. process that occured in the past
- 11. the process in which a radioactive isotope tends to break down into a stable isotope
- 12. fossilized structure
- 13. principle that states younger rocks lie under old rocks
Down
- 1. method of determining an event
- 3. an ordered arrangement of rock layers
- 6. the standard method used to divide Earth's long natural history into manageable parts
- 9. weather conditions in an area