Level 1!
Level 1.5 - this one is a dedication to Mr. GN! Thanks!!
Level 2!
And, if you're really into it... Here's a Level 3! :-D
Plate Tectonics and Structure of The Earth at Khan Academy. Khanacademy.org - geekiest site on the nets. My favorite place! You can keep clicking through to "Next Video" to watch more videos on the same topic.
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