6 Science U2, L3 Absolute Dating

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Across
  1. 2. __________ the time needed for half a sample to undergo decay and form a stable isotope
  2. 3. ________ isotope is a radioactive isotope
  3. 7. the number of times a broken clock is correct in one day
  4. 8. after _____ half-lives there is 12.5% of parent isotope left
  5. 9. the best type of rock sample to use with radiometric dating
  6. 12. unstable isotopes
  7. 14. the percent of parent and daughter isotopes after one half-life
Down
  1. 1. ___________ isotope is a stable isotope formed by radioactive decay
  2. 4. _________ dating finds absolute ages by percentage of parent and daughter isotopes
  3. 5. _________ dating determines the actual age of the rock or object
  4. 6. atoms of the same element with different number of neutrons
  5. 10. _______ lead dating is used to find the age of the Earth and solar system
  6. 11. ______ 14 is used to find the ages of organic matter up to 45,000 years old
  7. 13. fossils that are used to mark the time an organism lived on Earth