This site has links to two Flash animations. Evolution of Basin and Range Landforms demonstrates fault movement and subsequent sediment erosion and deposition that create mountains and valleys. Formation of a Sand Dune illustrates sand grain erosion, transport, and deposition from the windward to leeward side of a dune. These visualizations are from Chapter 13 (Deserts and Wind Action) of the animations section of the Online Learning Center for the McGraw-Hill textbook Physical Geology, 9th edition (ISBN: 0072402466) by Plummer, McGeary and Carlson.
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Part of the Cutting Edge collection. The NAGT/DLESE On the Cutting Edge project helps geoscience faculty stay up-to-date with both geoscience research and teaching methods.