geologic time scale

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Across
  1. 4. new rock on the top
  2. 6. any feature that cuts across a sequence of rock
  3. 7. help recognise a period of time
  4. 9. age gives age in actual years
  5. 10. life isotopes of some elements decay at a rate in products
Down
  1. 1. time scale a fossil used to identify the age of the rock layer
  2. 2. fossil provides specific info about rock layers and climate
  3. 3. era of dinosaurs
  4. 5. any rock fragment that is included inside another rock is older than the rock around it
  5. 8. age gives a relatives age of a rock