This 3-D model, 24"W x 18"H, depicts the substructures of all types of rock formations and incorporates hands-on activities as students match the rock specimens to the substructure. Graphic representation of the rock beds and real rock samples. Includes comprehensive Teacher's Guide which contains lab activities, color overhead transparency, blackline reproduction master, and 20 rock and sediment specimens. Transparent model cover and marking pen also included. Grades 5-12.