CK-12 Foundation
Ck 12: Earth Science: Principles of Relative Dating Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide summarizes key principles used in relative dating. Includes a few questions to check for understanding.
American Association of Physics Teachers
Com Padre Digital Library: Open Source Physics: Circular Well Superposition
A simulation that displays the time evolution of the position-space wave function using the Circular Well Eigenstate Superposition model.