Geologic time

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Across
  1. 4. long distinct period of history
  2. 6. study earth solid features
  3. 8. geology concerned with the order and relative position of strata
  4. 9. animal without a backbone
  5. 10. remains of plants and animals
Down
  1. 1. Arranging things into groups based on characteristics
  2. 2. animal with a backbone
  3. 3. Study ancient life using excavation and examination of fossil
  4. 5. hundreds of millions and billions years
  5. 7. distinct period of time which events are dated