In the atmosphere, a Hadley cell is a vertical circulation of air caused by convection. The typical
Hadley cells occur in the tropics, where hot air over the equator in the inter-tropical convergence zone rises, giving the heavy rain associated with tropical rainforests. In the upper atmosphere this now dry air then spreads north and south and, cooling, descends in the latitudes of the tropics, producing the North and South tropical desert belts. After that, the air is drawn back towards the equator, forming the North-East and South-East trade winds. Research Hadley cell
 
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