Science

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Across
  1. 2. Age
  2. 3. Crust
  3. 5. Structures
  4. 9. Zones
  5. 10. Waves
  6. 12. Drift
  7. 15. Selection
  8. 17. Variability
  9. 18. of Superposition
Down
  1. 1. Rocks
  2. 4. Currents
  3. 6. Extinction
  4. 7. Waves
  5. 8. Record
  6. 9. Wind
  7. 11. of Fire
  8. 13. Selection
  9. 14. Boundaries
  10. 16. Rocks