geologic time scale

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Across
  1. 3. any feature that cuts across a sequence of rocks, is younger than everything it cuts
  2. 5. preserved remains or traces of living things
  3. 6. Says you might not know the exact age, but you can tell if one rock layer is older than another layer
  4. 8. any feature that cuts across a sequence of rocks, is younger than everything it cuts
  5. 9. amount of time it takes for half of a remaining isotope to decay in a daughter product
Down
  1. 1. an undisturbed sequence of rocks, the oldest rocks are on the bottom and the youngest rocks are on top
  2. 2. Used of telling the age of the strata that it was found it
  3. 4. Uses radioactive isotopes to tell the age
  4. 7. takes a guess on how old something is by using things around it