Unit 2 Extra Credit

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Across
  1. 3. Crust is [blank] at diverging oceanic plates
  2. 6. Layer of Earth's atmosphere that blocks harmful radiation
  3. 7. Dense mineral found in the Earth's core
  4. 10. Landform created at converging oceanic-continental plate boundaries
  5. 11. Rate at which radioisotopes decay, making it possible to use decay to predict rock ages
  6. 13. The idea that the same processes happening today were happening in the past
  7. 17. Plate boundaries that slide in opposite directions
  8. 18. Formed by continental plate divergence
  9. 22. The largest time period in the geologic time scale (further broken into eras and periods)
  10. 24. Formed by continental plate convergence
  11. 25. Important molecule to sustain life on Earth
  12. 27. A mass event when large numbers of organisms die in a short amount of time
  13. 29. Plate boundaries that spread apart
  14. 30. Atoms with unstable nuclei that breakdown, or decay
Down
  1. 1. Measurable values that can be used to compare design solutions
  2. 2. A layer of gases the envelop at planet
  3. 4. Processes that add to the surface of the Earth, such as mountain building
  4. 5. The first organisms on Earth to begin photosynthesis
  5. 8. The characteristics of an organism that help it survive in a given environment
  6. 9. A natural event that has the potential to impact societies and the environment
  7. 12. Processes that destroy landforms, such as weathering and erosion
  8. 14. The numeric age of a layer of rocks or fossils
  9. 15. The youngest layers of rocks are found at the top and oldest layers are found at the bottom of a cliff
  10. 16. Conditions that must be met by an engineering design. These can limit the possible solutions.
  11. 19. Supercontinent that existed millions of years ago
  12. 20. The age of a rock in comparison to other rocks
  13. 21. Movement in the mantle caused by heat and density that moves the Earth's crust
  14. 23. The remains of a prehistoric organism that supports the theory of Pangaea
  15. 26. Plate boundaries that move together
  16. 28. Crust is [blank] at converging continental plates