Spheres

http://www.classzone.com/books/earth_science/terc/content/investigations/es0103/es0103page02.cfm?chapter_no=investigation

This article explains the spheres. I couldn't find copyright info T

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Whaeatina (talk)‎10:36, 4 October 2009

Hi We can't reproduce or publish content from this site, but it looks like we're ok to link to it. H

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Hmlamond (talk)‎15:01, 4 October 2009