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