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15:47 Hadley cells- form when warm air rises at the equator and sinks at 30 degrees N  or S Polar cells- form from the sinking of cold air at the poles and the rising of the air  at 60 degrees N or S Ferrell cell- within the Hadley cell, trade winds blow toward the equator to replace  air that rises due to heating by tropical ocean Pressure centers- places with the highest and lowest air pressure is observed in  a given region The Coriolis effect causes low pressure centers to rotate counterclockwise in the  Northern Hemisphere and clockwise in the Southern Hemisphere ( cyclone) and  vice versa for high pressure centers (anticyclonic) air moves from high pressure centers to low pressure centers Subtropical jet stream- a fast moving current of high-altitude air that stretches  across the globe Polar front- boundary where the poleward moving westerlies encounter the 
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