Geological Time

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Across
  1. 2. what period did the first dinosaurs appear
  2. 4. the naturally preserved remains or impressions of organisms that lived on the land long ago
  3. 5. what period did life explode
  4. 6. what period did dinosaurs become extinct
  5. 7. layers of rock
  6. 9. what type of time scale do scientist use to keep a record of life on Earth
  7. 12. fossils used by scientists to more accurately determine the age of nearby fossil or layer of rock
  8. 13. broken down pieces of rock that are moved from one place and deposited in another
  9. 14. layer of rock that is the oldest
  10. 15. what the law of superposition gives us
Down
  1. 1. a layer of rock is younger than the layer below it and older than the layer above it
  2. 3. the study of strata to determine the history of the land
  3. 8. there were many of something living at the same time
  4. 10. what type of dating do scientists use to find the age of fossils
  5. 11. layer of rock that is the youngest