http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Air circulates above the Earth in four distinct cells, with two either side of the equator, says new research. The new observational study describes how air rises and falls in the atmosphere above the Earth's surface, creating the world's weather. http://www.physorg.com/news138546084.html Space & Earth Thu, 21 Aug 2008 14:01:24 EST news138546084