Across
- 3. The amount of time it takes for half of a remaining isotope to decay to a daughter product
- 4. Any rock or fragment that’s included inside of another rock is older than the rock which is included
- 8. Isotopes of some element decay at a known rate into daughter product
- 9. An undistributed sequence of rocks the oldest rock is on the bottom and the youngest rocks on top
- 10. The exact age of something
Down
- 1. An undistributed sequence of rocks the oldest rock is on the bottom and the youngest rocks on top
- 2. Any feature that cuts across a sequence of rocks is younger than every thing it cuts
- 5. Useful for dating and coregulating the strata
- 6. the remains of an animal after a long time
- 7. the age of a rock layer compared to other layers