The document is a review package about structures and forces. It contains multiple choice questions about different types of structures like solid, frame, and shell structures. It also asks questions about concepts like center of gravity, static vs dynamic loads, and types of forces like tension, compression, and shear. There are also short answer questions asking about the differences between solid, frame and shell structures; why houses have different roof types; what happens when a structure's center of gravity is off to one side; and the differences between internal and external forces.