4th Grade-Ch. 6 Lesson 3 what are air masses

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4th Grade-Ch. 6 Lesson 3 what are air masses

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

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