4th grade-ch. 6 lesson 3 what are air masses
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Ch. 6Lesson 3
What are air masses?
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air mass•huge body of air that has almost same temp. & humidity (amount of water vapor in air)
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air mass•cause most weather
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air mass•forms over large areas of land or water
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Type of air mass Where it forms
Cool air mass polar areas
Warm air mass tropical area
Greater humidity over water
Less humidity over land
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What characteristics would an air mass that formed here
have?
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What characteristics would an air mass that formed here have?
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front• area where 2 air
masses meet
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front• 2 types:
1. cold front- move faster
2. warm front- move slower
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Cold air mass & a warm air mass meeting at a front.
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Air Masses and Fronts: How Weather Moves From One Place to Another [03:24]
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How clouds form:
1.Sun’s energy warms water
2.Heated water evaporates
3.Air rises & cools
4.Water vapor become tiny water droplets & ice crystals
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3 main types of clouds
cumulus stratus cirrus
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cumulus clouds
•fair weather
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cumulus clouds
•look like fluffy, rounded piles of cotton
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strstratatus cloudsus clouds• form in flatat layers close to
Earth’s surface
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cirrus clouds• feathery clouds • form high in atmosphere
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cirrus clouds Sometimes
called “mare’s tails”
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Song: Clouds Are Cool [02:45]
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•Cloud matching game
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form only at high levels
cirrus clouds
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Cumulus clouds
•look like fluffy, rounded piles of cotton
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Cirrus clouds Sometimes called “mare’s tails”
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strstratatus cloudsus clouds• form in flatat layers
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cirrus clouds• feathery clouds • form high in atmosphere
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cumulus clouds•fair weather