It's not quite right to say that the structure of the Earth and what it's made of are the same thing. They are closely related, but they are distinct concepts.

Here's the breakdown:

* Structure of Earth: This refers to the physical arrangement of Earth's layers. Imagine Earth like an onion, with different layers stacked on top of each other. These layers are:

* Crust: The thin, outermost layer where we live.

* Mantle: A thick layer of mostly solid rock, but with a semi-molten layer called the asthenosphere.

* Outer Core: Liquid iron and nickel.

* Inner Core: Solid iron and nickel, despite the intense heat.

* What Earth is made of: This refers to the composition of Earth's layers. Each layer is made up of different materials, with varying proportions of:

* Minerals: Like silicon, oxygen, iron, magnesium, calcium, etc.

* Elements: Like iron, nickel, oxygen, silicon, etc.

* Other materials: Like water, gases, and even traces of organic materials.

In summary:

* The structure tells us how Earth is physically organized (layers).

* The composition tells us what materials make up those layers.

So, the structure provides the framework, and the composition provides the details about what fills that framework.