Why is pizza like the earth's crust?

A slice of pizza can be used as a model for the earth's crust. The earth consists of a Lithosphere, Asthenosphere, and Mesosphere. On a pizza, the cheese represents the oceanic crust (oceanic lithosphere) and the toppings represents the continental crust (continental lithosphere) that floats on top of the oceanic crust. It is thin and more dense than the sauce which simulates the asthenoshpere. Dough-simulates the mesosphere (the slides).