1. - At the equator warm air rises and cools higher up., 2. - As it cools a rainy area of low pressure develops (Tropical Rainforest)., 3. - The air continues to cool and this denser air sinks towards the earth at 30ºN & S., 4. - The falling air forms an area of high pressure (blue skies) at the pole., 5. - This circulation of air is known as the Hadley Cell., 6. - At the poles the air is colder and heavier., 7.  - So air sinks and forms an area of high pressure at 90ºN or S., 8. - The air then flows towards 60ºN or S warming as it moves., 9. - As it warms it rises creating an area of low pressure at 60ºN or S., 10.  - This circulation of air is known as a Polar Cell., 11. - At 60ºN and S rising winds pull up air and at 30ºN & S air is dragged down by falling air., 12.  - This circulation of air creates a Ferrell Cell, though this is not a true cell.,

Atmospheric Circulation

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