Geologic Time Scale

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Across
  1. 3. States that if a fault cuts through a rock it is younger than the rock.
  2. 7. New layers of rock on old layers.
  3. 8. Amount of time it takes for half an isotope to decay.
  4. 9. Estimate of how old something is.
  5. 10. States that if rock fragments are in another rock, the rock is older.
Down
  1. 1. Fossils that are used for dating
  2. 2. Relating to the period before written records.
  3. 4. Representation of time based on the rock record of Earth.
  4. 5. Preserved remains of something.
  5. 6. Exact age of something.