I used this PowerPoint with my AP Environmental Science classes. The PowerPoint is 42 slides long (the preview has 6 slides out of the 42). This could also be used with biology or non-AP environmental science students. It discusses energy transfer through ecosystems and the 4 primary cycles associated with AP Env. Sci.: Nitrogen, Carbon, Phosphorous, and Hydrologic. It also discusses how we are altering these cycles and the effect of these alterations on the planet.
You will receive the editable PowerPoint file with 42 slides, so you can customize it to your liking or use as is.