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

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...

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

This lesson will show how a particle can travel in a wave form, by following perpendicular electric and magnetic fields. It is 1 of 4 in the series titled "Electromagnetic Waves."

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

This lesson will show how a particle can travel in a wave form, by following perpendicular electric and magnetic fields. It is 3 of 4 in the series titled "Electromagnetic Waves."

We rely on the sun to sustain life, but there are many things about the sun that the human eye is unable to detect. This media rich site offers a spectacular look at coronal mass ejections, magnetic loops, and solar flares. Interactive...

The Earth's magnetosphere helps shield us from cosmic and solar radiation. This segment offers a great explanation of this abstract concept along with numerous images and diagrams. An interactive game is provided as well.

The aurora borealis (also known as the northern lights) is a spectacular light display that can be seen at night in regions near the North Pole (auroras can also be seen near the South Pole). Auroras occur because of charged particles...

(1791-1867) British scientist, chemist, physicist, and philosopher who greatly contributed to the fields of electromagnetism and electrochemistry. His main discoveries include the magnet field, electromagnetic induction, diamagnetism,...

Laboratory of George Ellery Hale, inventor of the spectroheliograph, with which he made his discoveries of the solar vortices and magnetic fields of sun spots.