Geologic time scale

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Across
  1. 4. time scale: Is a record of the geologic event and the evolution of like form as shown in the rock and fossil records.
  2. 7. dating: Geologist use to determine the absolute ages of rocks.
  3. 8. A group of similar organism that can mate and reproduce.
  4. 10. Geologic time begins with a long span of time.
  5. 12. That´s why geologist continually the geologic time scale.
Down
  1. 1. Is a gap in the geologic record.
  2. 2. Eras are subdivided into units of geogolic time called
  3. 3. This vast numbers of years into manageable periods, scientist created the geologic time scale.
  4. 5. Is defined by the dominance of dinaosaurs and Pangaea breaking apart.
  5. 6. Are widely distributed in Earth´s rocks.
  6. 9. The present into three long units of time called
  7. 11. global: Geologist use the start of a period