Let’s look at a map of Iowa. Can you find where you live? What places have you been to and what have you seen as you’ve driven around the state? In this activity, we will prepare a pizza that is a geological replica of Iowa! Iowa’s rock and mineral foundation is several layers deep. The oldest layer is on the bottom, followed by the next oldest, then the next oldest, and so on. The layers of the earth under Iowa were molten or fluid initially. They hardened with time and pressure. Our pizza crust and cream cheese represent a common rock that is found in the layers deep below Iowa’s surface. It is called limestone. Limestone is also found on the surface of soil. Older rocks exist below the limestone layer, but we will not discuss that today.