I'm not sure what you mean by egg model, but if your talking about an egg representing the Earth, the eggshell would be the crust because the egg white is the mantle and the yolk is the core.
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The Earth's crust is the outermost layer of the Earth, made up of solid rock and divided into tectonic plates. The shell of an egg is the hard outer covering that protects the egg's contents, made up of calcium carbonate and protein. Both serve to protect what is inside, but they differ in composition and scale.
The Earth is like an egg in that they both have layers. Just like an egg has a shell, white, and yolk, the Earth has layers like the crust, mantle, outer core, and inner core. Additionally, the Earth, like an egg, has a protective layer (atmosphere for the Earth, shell for the egg).
The parts of my model are simplified representations of the Earth's structure. While my model may include the Earth's layers such as the crust, mantle, outer core, and inner core, it does not capture the complexity and intricacies of the actual Earth's components, which include varied compositions, densities, and physical properties. Keep in mind that models are used to represent real-world phenomena in a simplified manner for better understanding.
the yellow part of the inner egg
The lithosphere of an egg is the hard outer shell. It provides protection for the inner contents of the egg and helps maintain its structure.