Geologic Time

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Across
  1. 1. branch of geology dealing with the arrangement of sedimentary rock layers
  2. 5. Scientist who studies the Earth’s crust and the processes & history that shaped it
  3. 8. This Era means "Early Life"
  4. 10. Longest Era
  5. 12. (2word)This technique determines the order of past events but not the actual age
Down
  1. 2. (2word)This technique determines the the actual age of rocks and fossils
  2. 3. Earth is 4.6 ____ years old
  3. 4. The era when dinosaurs lived
  4. 6. The Law of ____ says younger rocks are on top of older rocks.
  5. 7. The end of a group of organisms,like a species
  6. 9. Current Era we are in
  7. 11. These fossils are used to indicate to geologists the boundaries in geological time.