Geologic Time crossword puzzle

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Across
  1. 3. Wiggle your ________
  2. 6. Bone above ulna
  3. 8. Bone under radius
  4. 10. Another word for a backbone
  5. 12. Rocks made of loose, eroded particles that harden together over time
  6. 14. Layers of rock
  7. 15. Determining if one rock is older than the other
Down
  1. 1. Refers to an approximate age of a rock layer
  2. 2. A living thing
  3. 4. The naturally preserved remains or impressions of organisms from long ago
  4. 5. Broken down pieces of rock that are moved from one place and deposited in another
  5. 7. Fossils used by scientists to more accurately determine the age of a nearby fossil or layer of rock
  6. 9. States that a layer of rock is younger than the layer below it and older than the layer above it
  7. 11. The numerical age of a rock layer
  8. 13. The study of strata to determine the history of the land