The Cycles of Matter powerpoint presentation covers the water cycle, nutrient cycle, carbon cycle, nitrogen cycle, and phosphorus cycle. Vivid pictures and diagrams help students understand each cycle and the important role each plays in our environment. Questions and terms are presented without the answer. Answers appear when the instructor clicks the mouse. This is an excellent format for classroom discussions. Search: Cycles of Matter worksheet/yorke for a free student worksheet to accompany this powerpoint presentation.