Physical systems

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Across
  1. 3. waves
  2. 4. currents
  3. 5. glaciers
  4. 7. tectonics
  5. 10. volcano
  6. 12. topsoil
  7. 13. mineral
Down
  1. 1. earthquake
  2. 2. tsunami
  3. 6. erosion
  4. 8. topography
  5. 9. gas
  6. 11. ocean