1. © William Wilkinson, InteractiveScienceTeacher.com What Causes Wind? Sun Earth

2. © William Wilkinson, InteractiveScienceTeacher.com What Causes Wind? cooler air warmer 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

3. © William Wilkinson, InteractiveScienceTeacher.com What Causes Wind? Sun Earth heat cooler air warmer 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 The sun’s energy hits earth unevenly

4. © William Wilkinson, InteractiveScienceTeacher.com heat 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! We call this air movement, and the moisture that accompanies it, ________ 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 equator-warmer 30N 60N 30S 60S pole-cooler Now think…where’s the warm spot on earth? Polar Westerlies Trade Now you finish the other convection cells on the side facing the sun. We’ll check them shortly. weather

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