Geologic Time Scale

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Across
  1. 2. the time taken for the radioactivity of an isotope to decrease to half its original value.
  2. 6. A scientist who studies earth that what it's made up of.
  3. 7. The process of breaking down or decomposing.
  4. 9. The law of relative dating that states any geological feature that cuts through rock has to be younger than the rock it disrupts.
  5. 10. The law of relative dating that states that any rock fragment inside of another is older than the rock it’s incased in.
Down
  1. 1. The time before humans began documenting history.
  2. 3. Remains or imprints of an organism found in rock
  3. 4. A living thing or life form.
  4. 5. The law of relative dating that states a rock layer under another is older than the top layer.
  5. 8. The most recent geological eon that we currently living in.