Waves Through Earth: Interactive Online Mac and PC part of Examples
Students vary the seismic P and S wave velocity through each of four concentric regions of Earth and match "data" for travel times vs. angular distance around Earth's surface from the source to detector.

Mass Balance Model part of Examples
Students are introduced to the concept of mass balance, flow rates, and equilibrium using an online interactive water bucket model.

Sun Path: Interactive On-line Mac or PC part of Examples
Students use SunPath in the yearly mode to investigate seasonal changes in sunrise, sunset, length of day and sun altitude at their own latitude. JAVA activity for Mac or PC.

Investigating Projectile Motion: Predicting Point of Impact part of MnSTEP Teaching Activity Collection:MnSTEP Activity Mini-collection
Students will understand that projectile motion is a result of two independent motions, horizontal and vertical by reading, problem-solving, and experimentation.