Geologic Time Scale

12345678910
Across
  1. 4. Used for Absolute Dating
  2. 7. In an undisturbed sequence of rocks, the oldest rocks are on the bottom and the youngest rocks are on the top
  3. 9. Layers
  4. 10. Comparing ages to determine order of Earth Events
Down
  1. 1. Any feature that cuts across a sequence of rocks, is younger than everything it cut
  2. 2. Amount of time it takes for half an isotope to decay to a daughter product
  3. 3. Any rock or fragment that’s included inside of another rock is older than the rock in which it is included
  4. 5. Lived 251-65 million years ago
  5. 6. Believed to be the first life form on Earth
  6. 8. Finding the exact age of something