Geologic Time Scale

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Across
  1. 2. Life only existed in or near this during the Paleozoic era.
  2. 3. Single celled organisms have been producing this for 2 billion years in this era.
  3. 5. These continue to push land masses across the Earth's surface.
  4. 7. swamps and forests were able to form because of this.
  5. 8. This era is characterized as the age of dinosaurs.
  6. 9. water vapour cooled and condensed to form this.
  7. 10. The era that covers 90% of Earth's history.
Down
  1. 1. This era lasted about 325 million years.
  2. 4. Several of these mass _____________ happened during this era.
  3. 6. 95% of all life on earth died.