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The inner core is solid and measures 1,516 miles in diameter.

he mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84% of Earth's total volume.

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The earth is divided into different layers because of density. Each layer has a different density and the densest layers like the core are in the middle and the less dense layers like the crust are on the outside. There are 3 different layers the core mantle and cruse you you can watch the 2 videos i liked for a very good explanation and a song to memorize the layers.
The 3 main layers can be divided into many smaller ones.

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I know it is long but it explains very well. Just turn it to speed 1.5.

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link crust and mantle song

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link

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link

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• Seismic waves show that the inner core is solid and the outer core is liquid.

• peridotite: Dense, dark igneous rock that makes up the mantle

• crust: Thin brittle outer layer of Earth.

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• continental crust: Portion of Earth’s crust that makes up the continents.

• oceanic crust: Portion of Earth’s crust that makes up the seafloor

• conduction: Process in which energy moves from a location of higher temperature to a location of lower

• convection: Movement of material due to differences in temperature.