Geologic time scale

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Across
  1. 1. describes all the events on Earth's history
  2. 3. age of dinosaurs, time of intense tectonic, climatic and evolutionary activity
  3. 7. newer rock layers will be on top of older ones
  4. 8. rate of decay of the isotope
  5. 9. assumption of age (law of superposition)
  6. 10. represent a specific period of time to help them find an age
Down
  1. 2. gives age in actual years
  2. 4. any feature that cuts across a sequence of rocks is younger than everything it cuts.
  3. 5. oldest layer
  4. 6. youngest layer