Wikimedia
Wikipedia: Magnet
Wikipedia.com provides an excellent introductory site on magnets. Including basic information describing different types of magnets and their characteristics.
National High Magnetic Field Laboratory
Magnet Academy: William Gilbert
William Gilbert was an English physician and natural philosopher who wrote a six-volume treatise that compiled all of the information regarding magnetism and electricity known at the time. The work included descriptions of many of...
National High Magnetic Field Laboratory
Magnet Academy: Timeline of Electricity and Magnetism: 600 Bc 1599
Find out how humans discovered the magnetic lodestone as well as the attracting properties of amber. Advanced societies, in particular the Chinese and the Europeans, exploited the properties of magnets in compasses, a tool that makes...
CK-12 Foundation
Ck 12: Properties of Magnets
[Free Registration/Login may be required to access all resource tools.] Looks at magnetic materials and the structure and breadth of a magnetic field. The concept of magnetic domains is explained, and how they behave in a magnetic field....
TeachEngineering
Teach Engineering: Magnetic Attraction
Students complete a series of six short investigations involving magnets to learn more about their properties. Students also discuss engineering uses for magnets and brainstorm examples of magnets in use in their everyday lives.
NASA
Nasa: Magnetic Fields
This site from NASA provides a short, illustrated description of the basics of magnetic fields and magnetic poles.
CK-12 Foundation
Ck 12: Physical Science: Magnets
A module that uses pictures, videos, reading passages, and review question to go over what a magnet and magnetic pole are, and how magnetic force is related to magnetic field. This site may require free registration to access all...
Other
Magnet Man: Cool Experiments With Magnets
Here is a lengthy listing of activities and resources pertaining to magnets and magnetism. Experiments which can be performed with many different types of magnets are described; detailed directions and photos are provided.
Georgia State University
Georgia State University: Hyper Physics: Magnetic Field of the Earth
This site is a description of the earth's magnetic field, including a section on the "Dynamo effect," a proposed explanation for the origin of the earth's magnetic field.
Physics4kids
Physics4 Kids: Electricity and Magnetism: Magnetic Fields
Explains magnetic fields, how they differ from electric fields, and attraction and repulsion.
Treehut
Suzy's World: Magnetism: Why Does a Compass Point North?
This fact sheet from Suzy's World and Suzy Cato explores how magnetism works, including "why a compass points north." Content includes fun facts, an experiment, and the ability to make your own compass.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Introduction to Magnets (Classroom Unit)
A teacher unit which includes several hands-on activities about types of magnets, magnetism, and electrostatics. An activity designed to suit all grade levels. Many parts of the activity would be easily adaptable as a student project.