Science Vocab

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