First there is the crust. That is what we living things live and stand on.
Second, there is the mantle. It is the place were lava stays. But when lava is underground we call it magma.
Thirdly there is the outer core. The outer core is just above the inner core.
And lastly there is inner core. It is as the same hot as the sun and is located right in the center of the earth.
Here is a photo of the 4 layers if you didn't understand and want a better view.