Geologic time

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Across
  1. 5. Your grandfather is older than you.
  2. 7. A law that states that a layer has to be already formed for another layer to have bits of it in it.
  3. 8. Half the time for an element to decay.
  4. 9. A law that states that the lower layer is older than the top layer.
  5. 10. The largest time interval.
Down
  1. 1. A law that states that cuts through layers are younger than the layers they cut through.
  2. 2. Your grandfather is 83 years old.
  3. 3. A fossil that is used to compare the age of other fossils.
  4. 4. The first known living organism on Earth.
  5. 6. The smallest time interval.