Time scale

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Across
  1. 5. The first eon.
  2. 7. We are in the _______ era.
  3. 8. The Jurassic period is in the _____ era.
Down
  1. 1. A part of a period.
  2. 2. Usually serve as the end of an era.
  3. 3. 2.5 billion years ago, this era started.
  4. 4. Pangaea broke up in this period.
  5. 6. The period where the biggest dinosaurs lived.