Earth's History and Fossils Review

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Across
  1. 3. Fossils of marine organisms in Mississippi suggest the state was once covered by this
  2. 4. A fossil used to date and correlate strata across regions
  3. 6. What fossils of aquatic plants in deserts suggest once covered the area
  4. 7. Higher oxygen levels in Earth’s past allowed insects to grow this size
  5. 10. Similar bone structures between fossils and modern species show this
  6. 12. Fossil record provides evidence that organisms share this
  7. 13. Modern marine mammals that evolved from land-dwelling ancestors
  8. 16. The softer layer beneath the lithosphere where plates move
  9. 17. Supercontinent evidenced by Glossopteris fossils
  10. 18. Believed to have caused the extinction of the dinosaurs
  11. 19. A mass extinction is an abrupt loss of this in the fossil record
  12. 21. Number of major mass extinctions in Earth’s history
  13. 22. Currents in the mantle that drive plate tectonics
  14. 23. Forces that can lift, fold, or change strata
  15. 24. The law stating that in undisturbed rock layers the oldest rocks are on the bottom
Down
  1. 1. The type of pattern shown in fossil sequences over time
  2. 2. Process at convergent boundaries where one plate sinks under another
  3. 3. The type of rock most likely to preserve fossils
  4. 5. Differences in traits that allow species to evolve
  5. 8. Period at the end of which dinosaurs went extinct
  6. 9. The theory that continents move over Earth’s surface
  7. 11. Earth’s crust and rigid upper mantle
  8. 14. Layers of rock that represent specific intervals of geologic time
  9. 15. Large moving sections of Earth’s lithosphere
  10. 20. The process by which organisms change over millions of years