Science

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Across
  1. 1. Numbers on a thermometer
  2. 5. They are made of water drops or ice crystals
  3. 8. A unit of air pressure
  4. 10. A layer made when water vapour turns into ice
  5. 11. Rain, snow and hail
  6. 14. A colourful arc in the sky
  7. 15. Used to measure air pressure
  8. 17. Moving air
Down
  1. 2. When water vapour changes into liquid
  2. 3. Used to measure temperature
  3. 4. The time when the Sun is highest in the sky
  4. 6. A short drop in air temperature to about −3°C
  5. 7. When water changes from liquid to gas
  6. 9. A layer made when water drops freeze into ice
  7. 12. A cloud close to the ground
  8. 13. Things that happen in the air around the Earth
  9. 16. Dew, frost and rime