by: Paul Lawless
Wind is caused by unequal heating of Earth's surface. Local winds are winds that blow over short distances. It is also caused by unequal heating of Earth's surface. A sea breeze is when the air over the water is cooler than the air over the land and this happens durring the day. A land breeze is when the air over the land is cooler than the air over the water. Global winds are winds that blow steadily from specific directions over long distances. Global winds are caused by unequal heating of Earth's surface. Global winds happen because cold air from the poles sink down to the equator where there is warm air and that rises and mixes with the cold air from the poles and that is a large convection current. Doldrums are when there are regions near the equator with little or no wind. Prevailing Westerlies blow generally from south-west in north latitudes and from the northwest in south latitudes. About 10 kilometeres above Earth's surface are bands of high-speed winds called jet streams. Cold air near the poles sinks and flows back toward lower latitudes. The coriolis effect shifts these polar winds to the west, producing the polar easterlies.
Bill Nye The Science Guy on Wind (Full Clip)