Geologic Time Scale

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Across
  1. 3. Prehistoric remains found over a period of time
  2. 4. A scientist who studies solid, liquid, and gas
  3. 5. A feature that cuts across a sequence of rocks is younger than everything it cuts
  4. 7. Amount of time it takes for half of a remaining to decay
  5. 8. Age based on rock layers
  6. 9. The law of included fragments
  7. 10. A fossil useful for dating and correlating in strata in which it is found
Down
  1. 1. Newer layers on top, older layers on the bottom
  2. 2. Age of something in actual years
  3. 6. the eon named after hades