This chapter features Earth and Space science StEMT lessons. The engineering design challenge calls for students to develop a technology to separate the materials in a mixture. Devising a means of separation for each type of material will expose students to the challenges of separating different types of materials. This challenge is about opportunities for learning the concept of human impact, not about developing the perfect design. A list of materials, teacher background information, standards, safety notes, assessment, and references are included. This book selection also includes the Table of Contents, Foreword, Preface, Acknowledgments, About The Authors, About Our Approach, Connection to Standards, Conclusion, Appendix A, and Index.