Meteorology/weather/climate

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Across
  1. 3. wind scale
  2. 4. happens when ice falls
  3. 7. the circle of water
  4. 12. brings bad weather
  5. 14. 5000m in the sky
  6. 17. masses of water
  7. 18. used to gather data
  8. 20. brings sowers
Down
  1. 1. steady blow of wind
  2. 2. stream of air
  3. 5. moving air
  4. 6. 4000m in the sky
  5. 8. 2000m in the sky
  6. 9. when things evaporate
  7. 10. low altitude
  8. 11. altitude
  9. 13. produces light
  10. 15. gas
  11. 16. 8000m in the sky
  12. 19. tropical air mass