Thanks! I used plaster of paris, sand from a local beach, and some old aquarium rocks that were in our driveway. I tried to do equal parts with water, plaster, and sand, but it was way too liquid. Then I added in things too fast and the consistency was great - right up until the rest of the mix hardened while I was making eggs! If you are going to try it, my advice is mix small amounts at a time and add the water last!
Sign up today for free teaching ideas, lesson plans, online activities, tips for your classroom, and much more.
Choose your grade range:
See a sample >