GPR can detect underground features such as abandoned mines or hazardous waste tanks. This is a commercial site for a company that uses this technology, but it offers pictures and information on what's possible.

Describes the characteristics of light, presents two formulas for calculating its wavelength, and provides a table of the different wavelength ranges across the electromagnetic spectrum.

Great animations showing how sound is produced.

Students are introduced to our planet's structure and its dynamic system of natural forces through an examination of the natural hazards of earthquakes, volcanoes, landslides, tsunamis, floods and tornados, as well as avalanches, fires,...

Detailed website that was a companion to a 1995 traveling exhibit of the Smithsonian. Links to lesson plans and other educational materials are at the bottom of the page. Enter the exhibition to explore the world of the ocean.

An experiment in resonance that demonstrates how to synchronize an applied force with an object's natural frequency and amplify the resulting motion.

In this activity, students play the game Simon Says to make the amplitudes and wavelengths defined by the teacher. First they play alone, and then they play with a partner using a piece of rope.

Describes the physics behind animals' ability to dry themselves by shaking to remove water.