This site has an interactive map, glossary, continental drift interactive quiz, and a word search. Click on such topics as "Evidence Supporting Continental Drift," "NASA's Role in Investigating Continental Drift," and "Why Should Continental Drift Matter to Me?"
This online book has the following chapters: "Historical Perspective," "Developing the Theory," "Understanding Plate Motions," "Hotspots," "Some Unanswered Questions," and more. There is also a PDF version of the book to download.
These sites include information on the topography of the ocean floor and life in the ocean. Sea floor spreading, plate tectonics, and underwater volcanic activity are topics found on several of the sites. Many sites have photographs, maps, and videos. Included are two eThemes resource sites for younger grades, one on the geography of the ocean and the other on creatures of the ocean.
tectonics, the Richter scale, epicenters, earthquake survival instructions, and more. Read about some of the largest earthquakes in history. There are quizzes, videos, and simulations. Included are links to eThemes Resources on the New Madrid Fault and Tsunamis.