Science

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Across
  1. 2. eras that are subdivided into units of geologic time.
  2. 7. record of the geologic events and the Evolution of Life.
  3. 9. dominance of dinosaurs and Pangaea breaking apart
  4. 11. when geologic time begins with a kind span of time.
  5. 12. the numbers of years that have passed since the rock formed.
Down
  1. 1. things that are widely distributed in Earth's rock.
  2. 3. it's age compared to the ages of other rocks
  3. 4. when life increased in complexity and Pangaea formed
  4. 5. the division of time between the precambrian and the present into three long units.
  5. 6. to make changes or improvement to something based on new data.
  6. 8. to make something neat or to put things in order.
  7. 10. people that studied rocks and fossils records.