Sunday, September 23, 2007
Sunday, September 9, 2007
What is wind?
The wind is a form of solar energy. The sun's rays heat the Earth's surface creating temperature differences between the land, water, and air, given their different propensities to absorb heat.
Windpwer
Humans have used wind power for transportation, water pumping, and grinding since the time of the ancient Egyptians. In the late 19th century, the Danes began harnessing wind to generate electricity using wind turbines.