Geologic Time Scale

12345678910
Across
  1. 3. Estimate of how old something is.
  2. 4. Exact age of something.
  3. 5. Representation of time based on the rock record of Earth.
  4. 8. States that if rock fragments are in a rock they are older than the rock.
  5. 10. Relating to the period before written records.
Down
  1. 1. States that new layers of rock on old layers.
  2. 2. States that if a fault cuts through a rock it is younger than the rock.
  3. 6. Amount of time it takes for half an isotope to decay.
  4. 7. Fossils that are used for dating.
  5. 9. Preserved remains of something.