Geologic Time Crossword

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