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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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