What part of an egg is compared to the Moho?

Here's why:

* Moho: The Mohorovičić discontinuity (Moho) is the boundary between the Earth's crust and the mantle. It is characterized by a sharp increase in seismic wave velocity.

* Shell Membrane: This thin membrane lies just beneath the eggshell and acts as a barrier between the shell and the egg's contents. It is also known for its strength and ability to resist pressure.

The Comparison:

Just as the Moho separates the crust from the mantle, the shell membrane separates the hard, protective shell from the delicate egg yolk and white. Both boundaries mark a distinct change in material and properties.

However, it's important to note that the analogy is a simplification and not a perfect comparison. The Moho is a geological boundary, while the shell membrane is a biological structure.