Dating crossword puzzle

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Across
  1. 5. _________ is used for tool making
  2. 7. An object made of crystalline material can be dated using ________________.
  3. 9. Thermoluminescence is an effective ______ but expensive.
  4. 12. Obsidian _________ is used to age tools.
  5. 13. ______________ is a technique that uses each tree ring to find what the life of the tree was like.
  6. 14. ________ is the perfect application of seriation.
  7. 16. Stratigraphy uses the law of ____________.
  8. 19. ________ is the design that changes depending of the pattern of the artifact.
  9. 20. Usually ________ is found in groundwater.
Down
  1. 1. dating Another name for Dendrochronology is ___________________.
  2. 2. Another word for pollen dating is ____________.
  3. 3. Potassium argon dating is the only __________ for dating old archeological materials.
  4. 4. ___________ is the scientific method of dating based the study of tree ring.
  5. 6. Ground water releases ________ remains where fluorine is stored.
  6. 8. All living things absorb _________.
  7. 10. When two _____ are similar ages.
  8. 11. _________ is the study of layers.
  9. 15. argon dating _______________ is the method used to measure how much argon there is in a mineral.
  10. 17. When people ___ the carbon 14 starts decaying.
  11. 18. __________ can be preserved or fossilized