Science Vocab

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Across
  1. 7. radioactive isotope breaks down to stable isotope
  2. 8. Divides Earth natural history
  3. 11. if an object is younger or older than others
  4. 12. Method of measuring age in years
  5. 13. A break in the geologic record
Down
  1. 1. Ordered arrangement of rock layers based on ages
  2. 2. comparing relevant percentages to get age
  3. 3. If undisturbed younger rocks lie above older rocks
  4. 4. explained by current geologic processes Climate involves weather conditions
  5. 5. remains of an organism that lived long ago
  6. 6. long cylinder of ice
  7. 9. the time required for half a sample to break down
  8. 10. A scientific study of Earth