geological time scale

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Across
  1. 2. the dating method of using radioactive half life to find a rocks age
  2. 7. a fracture in rock layers
  3. 8. a theory that states that older rock layers will be below younger ones
  4. 9. states that a rock in a different rock layer will be the older of the two
  5. 10. the dating method of comparing its age to other rocks
Down
  1. 1. a record of major events on earth split into a timeline
  2. 3. a type of fossils used to determine the age of other rocks or fossils
  3. 4. states that a fault or other things that cut across a rock layer will be younger
  4. 5. the preserved remains of an organism
  5. 6. the time it takes for half of an a radioactive atom to decay