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Global winds Winds that blow steadily from specific directions over long distances Created by unequal heating of earth’s surface Example of sun’s rays with a flashlight Global convection currents Movement of air between the equator and the poles produce global winds Coriolis effect makes winds curve Main Global wind belts Trade Winds Trade winds •Blow from the horse latitudes (30oN & S) toward the equator Sailors relied on trade winds to carry cargoes from Europe to the West Indies and South America Prevailing Westerlies •Blow from the west to the east (name comes from where winds blow FROM) Play an important part in the weather of the United States Polar easterlies •Cold air from the poles sinks and flows back toward lower latitudes The Coriolis Effect shifts these winds to the west, so they are called EASTERLIES. Has a major effect on the weather of the United States Doldrums Regions near the equator with little or no wind where warm air rises Horse latitudes •Calm areas of falling air 30* N & S Called horse latitudes because sailors ran out of food and water for their horses here and had to throw them overboard Jet Streams •About 10 km above Earth’s surface Blow from west to east at 200400km/h Planes flying east can save time and fuel by flying in the jet stream