Across
- 7. Something useful for dating the strata in which it is found
- 8. The exact age of someone or something.
- 10. The time it takes for the radioactivity of a specific isotope to decay to half of its original value.
Down
- 1. Any feature that cuts across a sequence of rocks, is younger than everything it cuts.
- 2. oldest rock
- 3. Any rock or fragment that’s included inside of another rocks is older than the rock in which it is included.
- 4. In an undisturbed sequence of rocks, the oldest rocks are on the bottom and the youngest rocks are on top.
- 5. bones or parts of a once living organism
- 6. A general idea of someone or somethings age.
- 9. The youngest rock