My daughter hit me with that question right after I rolled out of bed, and on this particular day, I was able to tell her that wind is caused by differences in air pressure from uneven heating of the earths surface (I had just read about it in an outdoor magazine). On other mornings, my answer would probably have been its air moving and I would have left it at that.
Its often a challenge dealing with curious minds, especially young ones that constantly have questions about the physical world and the family structure in which they find themselves (for example, questions like Why do I have to listen to you? or Why cant I take my iPad to church?)
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