US Geological Survey
Usgs: Plate Tectonics and Mid Oceanic Ridges
Excellent graphics and understandable text about all aspects of plate tectonics including mid-ocean ridges.
Texas Education Agency
Texas Gateway: Plate Boundaries
Find out about what happens at plate boundaries.
University of California
Ucmp: Plate Tectonics
Provides hyperlinks to the history behind and the mechanisms driving plate tectonics. Be sure to click on the globe icons for animations of plate tectonics.
PBS
Pbs: Mountain Maker, Earth Shaker: You Try It
What can a hard-boiled egg tell you about the Earth? Check this site out to learn. Be sure to click on "Plate Tectonics activity" for a graphic representation.
US Geological Survey
Usgs: The Himalayas: Two Continents Collide
This site from the U.S. Geological Survey explains how the Himalayas were formed by plate-tectonic forces. Includes a nice map to help visualize the theory.
Oregon State University
Osu: Volcano World: Spreading Plate Boundaries
This page has pictures and descriptions of different areas on Earth where the plates are spreading. Also includes links to more information on slow, medium, and fast moving plates.
Curated OER
National Park Service: What on Earth Is Plate Tectonics?
An easy-to-understand explanation of what plate tectonics is. Contains information about the inner parts of the Earth, the difference between the three types of plates, and numerous maps and illustrations.
CK-12 Foundation
Ck 12: Earth Science: Seafloor Spreading Hypothesis
[Free Registration/Login may be required to access all resource tools.] Covers seafloor spreading and the mechanism for continental drift.