Geologic Time

1234567891011121314
Across
  1. 4. The eon in which abiogenesis occurred
  2. 6. The era of geologic time in which the dinosaurs lived
  3. 8. Rule of ___ , says that undisturbed rock layers will have older rocks below newer ones
  4. 11. Determined by measuring the half life of radioactive materials
  5. 12. The remains of an ancient life form often used to date rocks
  6. 13. Rule of ___ , says that rocks contained within other rocks are older than the rocks that contain them
  7. 14. The technical term for the beginning of life
Down
  1. 1. The last period in the Mesozoic era, concluded by the K-T extinction event
  2. 2. Used to measure the time it takes for a radioactive material to decay
  3. 3. A rock piece found inside another rock
  4. 5. Our current eon
  5. 7. Rule of ___ , says that features that cut through rock layers are older than all layers that they cut through
  6. 9. The geologic epoch which humanity, by emitting CO2, has created
  7. 10. Determined by finding the age of layers relative to other layers around them