This 10 volume comprehensive set helps students with the transition from K-4 to 5-8 grade level studies. From basic objects in the sky, life-cycles, and properties of earth materials to the more advanced, structures of living systems, forces and motion and science technology, students will find what they need. Throughout all nine volumes students will find a Projects icon. This directs them to the Volume 10 (Index/Research Projects). Great for Science Fair Projects!