Hello and on this post it will show you an explaination of the Earths inner core, an experiment and something for fun.
The Explaination: http://www.metacafe.com/watch/yt-CiCBrXKIH_0/earths_magnetic_field/
The Experiment: http://video.google.com/videosearch?hl=en&q=video%20of%20how%20a%20compass%20works&um=1&ie=UTF-8&sa=N&tab=wv#q=magnetoshpere&hl=en&emb=0
The fun: http://www.metacafe.com/watch/1058665/magnetic_field/
Websites: Google video, Metacafe
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