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  • 1. Ch. 6 Lesson 3 What are air masses?
  • 2. air mass
    • huge body of air that has almost same temp. & humidity (amount of water vapor in air)
  • 3. air mass
    • cause most weather
  • 4. air mass
    • forms over large areas of land or water
  • 5. Where it forms Type of air mass over land Less humidity over water Greater humidity tropical area Warm air mass polar areas Cool air mass
  • 6. What characteristics would an air mass that formed here have?
  • 7. What characteristics would an air mass that formed here have?
  • 8. front
    • area where 2 air masses meet
  • 9. front
    • 2 types :
    • cold front- move faster
    • warm front- move slower
  • 10. Cold air mass & a warm air mass meeting at a front.
  • 11.  
  • 12. Air Masses and Fronts: How Weather Moves From One Place to Another [03:24]
  • 13.  
  • 14. How clouds form:
    • Sun’s energy warms water
    • Heated water evaporates
    • Air rises & cools
    • Water vapor become tiny water droplets & ice crystals
  • 15. 3 main types of clouds cumulus stratus cirrus
  • 16. cumulus clouds
    • fair weather
  • 17. cumulus clouds
    • look like fluffy, rounded piles of cotton
  • 18. str at us clouds
    • form in fl at layers close to Earth’s surface
  • 19. cirrus clouds
    • feathery clouds
    • form high in atmosphere
  • 20. cirrus clouds
    • Sometimes called “mare’s tails”
  • 21.  
  • 22. Song: Clouds Are Cool [02:45]
  • 23.
    • Cloud matching game
  • 24. It's time for Name that cloud
  • 25. form only at high levels cirrus clouds
  • 26. Cumulus clouds
    • look like fluffy, rounded piles of cotton
  • 27. Cirrus clouds
    • Sometimes called “mare’s tails”
  • 28. str at us clouds
    • form in fl at layers
  • 29. cirrus clouds
    • feathery clouds
    • form high in atmosphere
  • 30. cumulus clouds
    • fair weather