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Xtra Gr 11 Geography: In this lesson on Global Air Circulation we look global winds and pressure belts. We consider the direction of movement and the speed of winds related to pressure gradient, friction, pressure gradient force, coriolis force and geostrophic flow. We look at pressure gradient force and coriolis force in creating a tri-cellular circulation. We consider air mass characteristics. Finally, we look at regional as well as local air movements.