Rourke’s World of Science Encyclopedia teaches the essential concepts for elementary school science instruction. This 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. Make Rourke’s World of Science Encyclopedia an important part of your reference library. 10 volume set includes: Vol. 1 El Hombre, Vol. 2 Los Animales, Vol. 3 Las Plantas, Vol. 4 La Tierra, Vol. 5 La Quimica, Vol. 6 La Fisica, Vol. 7 Astronomia y el Espacio, Vol. 8 Las Matematicas, Vol. 9 La Tecnologia, and Vol. 10 Proyectos de Investigacion.