What part of a hard boiled egg used to model Earths structure?

Here's why:

* The yolk is solid and dense, just like the Earth's core.

* The yolk is in the center of the egg, much like the core is in the center of the Earth.

* The yolk is surrounded by a layer of white, representing the Earth's mantle.

Of course, this is a simplified model, and the Earth's structure is much more complex than a boiled egg. However, it's a helpful visual aid to understand the basic concept of the Earth's layers.