In this course, students will study the many impacts that humans have on the environment through the exploration of existing ecosystems. In unit two, students will experiment with pure substances and mixtures and will come to recognize that most matter is either a solution or a mechanical mixture. Heat energy will be explored and students will examine the critical role heat plays in natural processes and human life. By working to understand the nature of heat, students will gain new insights into the ways that heat affects our world, the causes and effects of heat, its properties, and heat transfer. Finally, students will consider the functions that structures must perform and the impact of these structures on the environment.