Curated OER
Mid-Ocean Magnetism
Students investigate magnetic evidence that supports the theory of sea floor spreading.
US Geological Survey
Usgs: Understanding Plate Motions
The U.S. Geological Survey provides descriptions and illustrations for the plate boundaries of the Earth's surface.
Encyclopedia Britannica
Encyclopedia Britannica: Geology: Deep Sea Trench
Detailed information about oceanic trenches, their structure, and how they are formed. Discusses the twenty trenches that exist around the world. Includes several labeled illustrations.