NASA
Nasa: Magnetic Reversals and Moving Continents
This site gives a good overview of magnetic reversals. Discusses continental drift, ocean floor magnetism, and sea-floor spreading.
CK-12 Foundation
Ck 12: Plix: Bathymetric Evidence for Seafloor Spreading
[Free Registration/Login Required] A site where students can label the features of the ocean floor such as: mid-ocean ridge, rift, and more. Also on the site is a short quiz about the different topography of the ocean floor.
Vision Learning
Visionlearning: Plate Tectonics: The Origin of Plate Tectonic Theory
Discover Alfred Wegner's ideas relating to continental drift and seafloor spreading which are both evidence to the concept of plate tectonics.
US Geological Survey
Usgs: How to Build a Model Illustrating Sea Floor Spreading
This is a comprehensive website featuring how to build a model that illustrates sea-floor spreading and subduction. It has diagrams and pictures reviewing major geological concepts.
Vision Learning
Visionlearning: Earth Science: Plate Tectonics I: Geologic Revolution
Instructional module focusing on the development of plate tectonic theory. Discussion includes the evidence of Pangaea, and the processes of seafloor topography and seafloor spreading. Site also includes an interactive practice quiz and...
US Geological Survey
Usgs: Developing the Theory
This comprehensive overview of continental drift takes a historical look at the various types of evidence which led to the development of the theory.