This is part of the series of 30 exercises developed during the 3D4KIDS program. One of the aims of this Erasmus+ program is to improve the knowledge of teachers regarding the 3d printing technology by developing some specific training materials. More info in the website: https://www.3d4kids.eu/ The lesson is about designing and printing the composition of the earth in order to understand how the earth was formed and how it is composed. It will also serve to identify the different layers parts of the earth, other than to locate it in the solar system. It will also serve to learn and to understand the 3D printing technics.