1. Crust:

* This is the outermost and thinnest layer, composed of solid rock.

* It's divided into the oceanic crust (thinner, denser, and younger) and the continental crust (thicker, less dense, and older).

2. Mantle:

* The largest layer, extending from the crust to the outer core.

* Composed of mostly solid rock, but behaves like a very viscous fluid over long periods due to immense heat and pressure.

* It's responsible for plate tectonics and volcanic activity.

3. Outer Core:

* A liquid layer composed mainly of iron and nickel.

* Extremely hot and generates Earth's magnetic field.

4. Inner Core:

* A solid sphere of iron and nickel, despite the extremely high temperature.

* The intense pressure prevents the iron from melting, making it solid.

Here's a simple analogy: Imagine an apple.

* Crust: The skin of the apple.

* Mantle: The fleshy part of the apple.

* Outer Core: The core of the apple, which is mostly liquid.

* Inner Core: The seed of the apple, which is solid.