Ch 6 Change Over Time

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Across
  1. 3. after that
  2. 5. Similar structures that related species have inherited from a common ancestor
  3. 6. A fossil in which minerals replace all of an organism
  4. 8. These types of fossils are useful because they tell the relative ages of the rock layers in which they occurred
  5. 13. A break in Earth’s crust
  6. 14. The solid copy of the shape of an organism
  7. 16. Preserved remains or traces of living things
  8. 18. The pattern where species evolve during short periods of time and then don’t change
  9. 20. An extremely thin coating of carbon on rock
  10. 22. The change in living things over time
  11. 26. A process where better adapted organisms are more likely to survive and reproduce
  12. 27. The number of years that have passed since the rock formed
Down
  1. 1. The age of a rock compared to the age of other rocks
  2. 2. The law that states that in undisturbed rock layers the oldest layer is at the bottom
  3. 4. A trait that increases an organism’s ability to survive and reproduce
  4. 7. A footprint buried by sediment
  5. 9. A well tested concept that explains a wide range of observations
  6. 10. A group of similar organisms that can mate with each other and produce fertile offspring
  7. 11. A process of change over time
  8. 12. A gap in the geologic record
  9. 15. A hollowed area in sediment in the shape of an organism
  10. 17. Any difference between individuals of the same species
  11. 18. Scientist who studies fossils
  12. 19. When an organism no longer exists and will never again live on Earth
  13. 21. When magma pushes into bodies of rock below the surface, cools, and hardens into
  14. 23. rock
  15. 24. Lava that hardens on the surface and forms igneous rock is called this
  16. 25. Small changes that add up to major changes over a long period of time