If the Earth was an egg, the shell would be the crust of the Earth.
The white of the egg would be the Earth's mantle.
The yolk of the egg would be the Earth's core.
We lightly cracked the egg and imagined that the cracked pieces were the tectonic plates of the Earth. We moved them a little, and pushed some bits under other bits. It helped us to visualise how earthquakes happen.
Can you name any of the tectonic plates?