For Teachers Human Activity and the Earth (several) Reduce, Reuse, Recycle - Save the Planet! Analyzing Ecosystems (several, 9th) Ecology - Free Presentations in PowerPoint format for K-12 Science  See Also: Pollution For Kids Games & Kids Sites  Resources Free Presentations in PowerPoint format for K-12 Science  Video Clips for Science Free Clip Art  All Rights Reserved    Clip Art Credit: Phillip Martin Have a great year!