If you are using the 1st edition: Consider Chapter 8 as an addition to Chapter 7, and note the +1 change in numbering for Chapters 9-21. The newe-modulesdo NOT require FlashPlayer and run on iPads, smartphones in as well as computers.
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These e-learning modules give the student/reader an opportunity to approach Plate Tectonics in a somewhat different way, by means of animations and short and conscise text. Hence, these e-modules do not replace the book, they are just a supplement.