Source
https://commons.wikimedia.org/wiki/File:Земйа.jpg

The Layers of the Earth 

The part of the Earth that we live on is called the Crust.  

But, the Earth actually has 3 hidden layers that we cannot see.

These 3 hidden layers are called the inner core, the outer core, and the mantle. 

Inside the mantle, something called magma is made.