After shaking it all up, they let it set and this is what they got!
There is an entire Terrarium Habitats kit by GEMS (Great Explorations in Math and Science) that is available from Carolina that includes everything for $344. I got mine a couple years ago for participating in a grant study and would highly recommend it if you are interested in doing a unit on terrariums! I just rinse everything off when we were done with it and reuse it all again the next year!
If you don’t want to buy the whole kit you can find a lot of the supplies you need at local stores. You can even order parts of the kit separately if there is anything you can’t find on your own.