NASA
Nasa: Magnetic Reversals and Moving Continents
This site gives a good overview of magnetic reversals. Discusses continental drift, ocean floor magnetism, and sea-floor spreading.
PBS
Nova: Magnetic Storms: When Compasses Pointed South
Earth's magnetic poles have reversed themselves throughout its long history. Find out what scientists know about these reversals. A geologic time line shows when the reversals occurred.
Smithsonian Institution
Smithsonian: This Magnetic Map Shows Earth as You've Never Seen It Before
This article discusses a map generated by the European Space Agency's Swarm mission that depicts Earth's magnetic field using satellites to measure magnetism. The map reveals magnetic stripes and magnetic anomalies. The article includes...
Other
This Old Earth: Geology Online: Paleomagnetism and Continental Drift
Discusses discoveries that laid the foundation for scientists' understanding of paleomagnetism, continental drift, and magnetic reversals.
National Earth Science Teachers Association
Windows to the Universe: Magnetic Field Reversals
Provides a short article, with embedded links, about magnetic reversals and how they might occur.