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