Woods Hole Oceanographic Institution
Woods Hole Oceanographic Institute: Mid Ocean Ridges: Types of Ridges
A detailed, interactive look at the mid-oceanic ridge. Learn more about slow and fast spreading ridges and how the polarity of the ocean floor helps determine the speed of spreading.
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.