This activity demonstrates liquefaction, the process by which some soils lose their solidity during an earthquake. Learners will use a loaf pan, sand, water and a brick to model what happens to buildings built on sandy soil during a powerful earthquake. Many buildings in the San Francisco Bay Area are built on landfill, sand, or mud that can liquefy, and as a result much of the damage in California’s 1989 Loma Prieta earthquake was caused by liquefaction.