Geological time scale

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Across
  1. 2. reduces half its initial value
  2. 4. the rule that the rocks on top are younger and the rocks on the bottom are older
  3. 6. the rule that a younger layer cuts into an older layer
  4. 7. knows if it is younger or older without knowing specific ages
  5. 8. specific time and date of a fossil
  6. 9. the rule that rocks inside of another rock are older than the rock it is in
  7. 10. when the same fossil is in only one layer
Down
  1. 1. ionizing radiation of particles
  2. 3. helps with relative dating
  3. 5. series of layers of rock in the ground