This hands-on model makes illustrating the mysteries of the earth easy. The outside of the model shows the oceans and continents. The earth's two hemispheres separate to show the four main layers of the earth: crust, mantel, outer core and inner core, their temperatures and depths. It's easy for students to handle and examine because it's made of soft foam and measures 5" in diameter. Includes fact-filled activity guide. Grades Pre K-3.