A slideshow and a short multiple-choice quiz on the basic concepts and vocabulary of magnetism.

Topics covered in this slideshow include the Earth's interior, seismic S- and P-waves, the crust and mantle, phase boundaries encountered by seismic waves, the Earth's internal heat, gravity and density, gravitational anomalies, the...

This series of images is a combined collection of over three museums' collections of physics electricity and magnetism images. The images are sorted by pages with about nine images per page and five pages.

An in-depth look at how isostasy works and the processes taking place during glaciation and the melting of glaciers. Looks at gravity and the effects of density differences within the crust and mantle, and at Earth's magnetic field and...

Compasses and special metal filings help you "see" the invisible force of magnetic fields. [2:25]

This lesson will introduce what a magnet is and how magnets work.

Learn how to make a simple compass right at home. [1 min, 21 secs]

See drawing from Hans Christian Orsted's lab notebook showing an experiment in which an electric charge passing through a wire seemed to create a magnetic field!

A bell jar, Peeps and balloons demonstrate how changing the atmospheric pressure around objects can change their size. [3:18]

A slideshow carbo-loaded with information on how the pneumatic potato cannon works. [3:00]

View a computer model simulation from NOVA Online that illustrates what happens during a magnetic field reversal, an infrequent occurrence that may be currently underway.

This slideshow gives an advanced-level explanation of how to calculate the distance that tectonic plates move by using Physics formulas and concepts. Includes a discussion of marine magnetic anomalies and how these impact plate movement....

A good visual introduction to permeability, comparing the magnetic permeabilities of air and iron. This site provides a good conceptual introduction to this topic.

magnets

magnets

This photo clearly shows that like poles of a magnet repel each other. This effect can be quite strong. In this image, as a child holds down the top magnet down with their fingers, it looks like the top magnet is floating due to the...

Iron filings are used in this picture to show the path of magnetic field lines created by a magnet.

This spectacular photo shows an interesting formation created by powder steel on a magnet. The powder steel forms spikes pointing in all directions away from the end of the magnet.

An image of the Spacecraft Magnetic Test Facility.

Illustration of magnetic repulsion field lines.

Illustration of Earth's magnetic field lines.

This site from Integrated Publishing provides three different examples of theories of magnetism.

magnets

Illustration of magnetic attraction field lines.