Geologic Time Scale

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Across
  1. 5. In an undisturbed sequence of rocks, the oldest rocks are on the bottom and the youngest rocks are on top.
  2. 8. Relative age is the age of a rock layer (or the fossils it contains) compared to other layers.
  3. 9. oldest eon
  4. 10. Any feature that cuts across a sequence of rocks, is younger than everything it cuts.
Down
  1. 1. a number of the age of a layer or fossil
  2. 2. Newest eon
  3. 3. a supercontinent
  4. 4. the time required for a quantity to reduce to half of its initial value.
  5. 6. a fossil that is useful for dating and correlating the strata in which it is found.
  6. 7. Any rock or fragment that's included inside of another rock is older than the rock in which it is included.