Free Presentations in PowerPoint format & Free Activities for Kids This huge section lists free presentations for Earth, Space, Weather, Human Body, Simple Machines, Natural Hazards, Biomes, Living Systems, Light, Sound, Energy & Motion, Weathering and Erosion, Environment, Ecology, Geology, Biology, Chemistry, Physics, Lab Work, Microscopes, Telescopes, Nanoscience, Forensics for Kids, Flight, and  more. Teachers around the world have been so generous with their lessons and learning modules and games in powerpoint format! Take a look! The art on our website was created by Phillip Martin. Some of this art may be freely used on your website. Please review our restrictions prior to use.