What is the layer in the middle of earth

The Mantle layer is approximately 2885 kilometers thick and is the middle layer of the Earth. The Mantle is made up of minerals rich in the elements iron, magnesium, silica, and oxygen. The Mantle makes up approximately ~85% of the Earth's volume.

the order of the layers are The Crust, The Mantle, The Outer core and The Inner core.

Explanation:

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the answer is a because there all in high school