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www.powerhouseanimation.com/...prg_earthLayers.swf earth-layers
education.nationalgeographic.com/...Earth_Interior_Poster.pdf earth-layers poster interior
www.globalchange.umich.edu/...plate_tectonics.swf
channel.nationalgeographic.com/...ring-of-fire ring fire
Ed B.
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Updated on Feb 26, 13 Created on Jan 29, 13
Category: Schools & Education
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