Below are a few pointers.
Google suggests:
http://www.google.com/educators/p_earth.html
This is k12:
http://www.teachinghacks.com/2006/11/03/google-earth-as-a-classroom-tool/
From the Google Earth blog:
http://www.gearthblog.com/blog/archives/2006/08/back_to_school.html
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