This is my 7-year-old son’s last-minute Science Week project. After the project we’ve been working on failed, the results were pretty good. Enjoy it and give it a try. This is what you need. Cactus, you can buy cheap, you need some sand or some small plants, grass or moss. The branches and small stones are in the garden, and there are 1 or more young children. We use music from http//www.bensound.com.