Native Americans commonly use a circle in their art and stories to represent the fact that matter is conserved. From generation to generation, Native Americans passed on the idea that matter is conserved and used the wheel, hoop, or circle as a symbol of endlessly repeating cycles, such as night and day and life and death. The purpose of the medicine wheel activity decribed in this article is to present a tool for teaching natural cycles. Each of the nine illustrated cycles represents natural cycles that are important science concepts for students to understand.