Time scale

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Across
  1. 2. the era in which dinosaurs went extinct
  2. 3. the era in which the first plants evolved
  3. 4. The second era in the Earth's history.
  4. 6. the longest eon in the earths history
  5. 8. the current era in the earth's history
Down
  1. 1. The period in which humans evolved.
  2. 3. The third era in the Earth's history.
  3. 5. the era in which the first land animals evolved
  4. 7. The largest unit of the geological time scale.