Periodic Table & Middle School Science Songs About Atoms, Protons & Structure of Matter
Introduction to the atom
Khan Academy
Vernier Software & Technology
Seize a teachable moment! Matt Kuchta teaches how earthquakes are produced in subduction zones with a model "earthquake machine," using a brick, sandpaper, a Dual-Range Force Sensor, and a Low-g Accelerometer. (with video)
M3 science seismographs for earthquake project