From site: Subduction Construction is an educational game in which players examine Franciscan Complex rocks of the Golden Gate Headlands to place them in the context of the Cretaceous Period subduction zone.
Players use high-quality, digital images of rocks from seven collection sites of the Golden Gate Headlands to record geologic data in the field. Then they bring their rock samples to the lab and perform tests to complete the identification of the rock samples.
Players are ready to visit the subduction zone and begin construction once they accurately identify the rock samples. Successful placement of all the rocks starts an animation of the subduction zone, which helps players visualize the tectonic movements that formed much of the dramatic geologic scenery of the San Francisco Bay Area.