And of course, don't (unless you don't mind the cost) worry about having to go to the store to buy clay for this project. At instrucables.com, you can find a recipe for making your own clay right from the kitchen cabinets! Here is their link:
So enjoy getting creative and building a fantastic centerpiece for this week's dinner table!
Additional suggestion: If you homeschool, do a lesson on mountains this week! Study the terrain, how mountains form, etc!