Science unit 2 crossword BY: JOEL ROHDE

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Across
  1. 3. The time requiierd for half of a sample of a radioactive isotope to breakdown
  2. 9. An ordered arrangement of rock layers that is based on the relative ages of the rock
  3. 12. A principle that geologic processes that occurred in the past can be explained by current geologic processes.
  4. 14. Any method of measuring the age of an event or object in years
  5. 15. A method of determining the absolute age of a object
Down
  1. 1. The standerd method used to divide earths long natrual history
  2. 2. The weather conditions in a area over a long period of time.
  3. 4. The trace or remains of remains of an organism that lived long ago.
  4. 5. A principle that states that younger rocks lie above older rocks if the layer has not been disterberd
  5. 6. The process in which a radioactive isotope tends to break down into a stable isotope to the same ele
  6. 7. Any method of determining whether an event or object is old or young.
  7. 8. A principle that states that younger rocks lie above older rocks if the layer has not been disterberd
  8. 10. A fosslized structure, such as footprint or a coprolite.
  9. 11. The scientific study of the origin of earth
  10. 13. A long cyllinder of ice obtained from drilling through ice caps or ice sheets.