posted on December 01, 2006 07:57
Solar energy plays two direct roles: it evaporates water and, by warming the atmosphere, increases its ability to carry more water vapor. Solar energy also plays a significant indirect role. Some places are warmer than others. By a relatively complicated mechanism, these differences in air temperature result in pressure differences. Air located in an area of higher pressure will naturally flow towards areas of lower pressure. The exact path the air takes is a function of many things, including the shape of the land and the rotation of the Earth. The net result, however, is wind. When you think about it, therefore, the motion of the air – the wind – is a form of solar energy.
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