Across
- 3. The largest division of geologic time
- 4. A way of determining if an event is older or younger than another event
- 6. A break in the Earth’s crust where rock slides by each other
- 10. The second largest, consists of 2 or more periods
- 11. Periods are divided into smaller sections called Epochs
- 13. Gaps in the Geologic Record
- 14. The youngest rocks lie on top of the older rocks in a sequence.
Down
- 1. Eras are divided into smaller sections called periods
- 2. Rock layers bend and deform due to internal forces in the Earth
- 5. The history of the Earth as recorded in the rocks of the Earth’s Crust
- 7. A fossil that can be used to date the surrounding rock layers
- 8. Which Era is known as the Age of the Dinosaurs
- 9. Earth is 4.6 _________ years old
- 12. How many mass extinctions have their been?