Across
- 3. Any feature that cuts across the sequence of rocks is younger than everything it cuts
- 4. Newer rock layers are on top of older ones
- 8. Preserved remains
- 9. You can find age by looking at rock layers
- 10. A large time period with different events occuring within it
Down
- 1. Some unstable isotopes of some elements decay at a known rate
- 2. The time it takes for half an isotope to decay
- 5. Any rock or fragment that’s included inside a of another rock is older than the rock its included into
- 6. When the same fossils are found in the same layer of rocks across the Earth
- 7. A single celled organism