Across
- 5. unit of geological time that includes two or more periods.
- 6. testing
- 7. feature that cuts across is the youngest than everything it cuts
- 8. for dating and corresponding the strata in which it is found
- 11. to represent a period of time
Down
- 1. to determine age
- 2. rocks are on top
- 3. law of included fragments
- 4. division of Earth’s history based on major geologic events and life forms
- 9. of time it takes
- 10. half of remaining isotopes to decay