geologic time

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Across
  1. 2. Age exact date
  2. 4. the time it takes for half of the parent atoms to become daughter atoms
  3. 5. remains or impression of a prehistoric organism
  4. 6. Horizontality-the law that layers are horizontal not vertical
  5. 7. time of the dinosaurs
  6. 8. a surface of contact between two groups of uncomfortable rock strata.
  7. 10. Fossil fossils scientists use to help with relative age
Down
  1. 1. older rock found in younger layers is called
  2. 3. the older layers are on the bottom and as you go up layer you down in age .
  3. 9. Age a range of time