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: Pacific Seafloor Mapping Project
This site describes the details of a project to map the seafloor of the Pacific Ocean. Includes images, movies, links to related information, and more.