NASA's Plate Tectonics
Learn more about the slow voyage of the continents which has reshaped the face of Earth throughout its history.

Earthquake Facts & Lists
Check out these USGS links to sites with information about plate tectonics and earthquakes, including the most significant global quakes, state-by-state largest quakes, the New Madrid and San Andreas faults, and much more.

Volcano World
Find just about everything you ever wanted to know about Earth's current and past volcanic activity, courtesy of the University of North Dakota.