Check out this Bill Nye Video!

Learn about the Earth's crust! Copy and paste these links into your browser to watch the video.

Part 1:
http://www.youtube.com/watch?v=oTFX8Gn9K-c&feature=related

Part 2:
http://www.youtube.com/watch?v=uMcNCbR7B40&feature=related

Part 3:
http://www.youtube.com/watch?v=L7z3O5ZcGio&feature=related