Geologic time scale

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Across
  1. 2. Superpositon is layers are stacks on eachother
  2. 4. a eon is a very long time period
  3. 5. Relative age is the estimated age of something
  4. 8. A long period of history
  5. 10. The mesozoic eon is the age of the first land species.
Down
  1. 1. Absolute age is the exact age of something
  2. 3. Pangaea is a supercontinent
  3. 6. time periods are short pieces of history.
  4. 7. The paleozoic eon was the first of the marine species
  5. 9. a person who studies the structure of Earth's history