Geologic Time Scale

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Across
  1. 1. Time that spans the largest portion of Earth's history.
  2. 4. Modern ___________ appear (200,000 y.a.)
  3. 6. Period we currently live in.
  4. 8. Era when the first fish appeared. (530 m.y.a.)
  5. 9. Era known as the "Age of the Reptiles" (Dinosaurs roamed the Earth.)
  6. 10. Eon we currently live in.
Down
  1. 2. First ____________ appear. (385 m.y.a.)
  2. 3. Period when the first mammals appeared. (178 m.y.a)
  3. 5. Person that studies the materials, process, and history of the Earth.
  4. 7. Period of time where there was an explosion of complex organisms.
  5. 10. A cell without a nucleus.
  6. 11. Time, _______, Era, Period