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What Causes Wind?
Draw a box here
Earth
Sun
© William Wilkinson, InteractiveScienceTeacher.com
What Causes Wind?
warmer air
cooler air
-air moves slower, so
-molecules are closer, so
-there’s more air, so
-it’s heavier; we call this
higher_______
pressure
_____
© William Wilkinson, InteractiveScienceTeacher.com
-air moves faster, so
-molecules are further apart, so
-there’s less air, so
-it’s lighter; we call this
lower_______
pressure
_____
What Causes Wind?
warmer air
cooler air
-air moves slower, so
-molecules are closer, so
-there’s more air, so
-it’s heavier; we call this
_____
_______
higher
pressure
-air moves faster, so
-molecules are further apart, so
-there’s less air, so
-it’s lighter; we call this
_____
_______
lower pressure
heat
Sun
heat
heat
Draw boxes here
Earth
•The sun’s energy hits earth unevenly
© William Wilkinson, InteractiveScienceTeacher.com
Polar
heat
Westerlies
Trade
Trade
heat
Now think…where’s the
warm spot on earth?
Now you finish the other
convection cells on the
side facing the sun. We’ll
check them shortly.
Westerlies
Polar
•The sun’s energy hits earth unevenly
•Warmer, lighter air rises while the cooler, heavier air
sinks
•The greater the difference between the 2 temperatures,
the faster the air moves!
Summary:
•The sun drives air movement on
earth
•This moving air holds moisture; the
effects of this we call weather
_______
•Thus, the sun drives earth’s weather •The Trade Winds blow from the equator to 30°N/S
•The Westerlies blow from 30°N/S to 60°N/S
•The Polar Easterlies blow from 60°N/S to 90°N/S
© William Wilkinson, InteractiveScienceTeacher.com
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