Across
- 5. any segment of a rock that is included in a different rock is older than what it is included in
- 7. how old one layer is compared to another Ex: The Bottom layer is oldest while the topmost layer is youngest
- 8. The petrified remains of an organism
- 9. based off the law of Superposition
- 10. Ex: Rock A is younger than Rock B
Down
- 1. everything that cuts across a sequence of rocks is younger than everything it cuts
- 2. Ex: Rock A is 200 years old
- 3. a fossil that is used to identify the relative age of a rock
- 4. rate of decay of a radioactive rock
- 6. using the Half-Life of a rock to identify its age