Geologic Time Scale CrossSearch

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Across
  1. 3. Era that ranged from 540 m.y. to 250 m.y.
  2. 4. Era that ranged from 250 m.y. to 65 m.y.
  3. 7. rock layers
  4. 11. A scientist that studies fossil remains found on the Earth’s surface in order to study primitive life forms such as: plants, animals, fungi, and bacteria
  5. 12. A scientist who studies the Earth’s crust as well as the processes and history that shaped it
  6. 13. Time of Earth’s history from the beginning to approximately 540 m.y.
Down
  1. 1. geologists use radioactive decay to determine the actual age of a rock
  2. 2. The Law of _________ - younger rock layers are on top of the older ones, unless some type of disruption occurs.
  3. 5. The current Era
  4. 6. A branch of geology dealing with the arrangement of sedimentary rock layers or strata
  5. 8. traces of animals, plants, and other organisms from the remote past
  6. 9. The comparison of one rock or fossil to another to determine which one is older or younger
  7. 10. the predictable time an element takes to decay.