Geological Time Scale

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Across
  1. 1. piece of time
  2. 5. high melting points
  3. 6. seperating something
  4. 7. long period of time
  5. 8. set of connected things
  6. 10. period of time
Down
  1. 2. living organisms are thought to have developed
  2. 3. used in measurements
  3. 4. going back in time
  4. 9. where we live