Built up in layers. The main part of the earth is fluid Mantle, consisting of silicates. In volcanic eruptions this viscous material is recognized as Magma. The core is mainly made up of iron, and despite the higher temperature (about 5000 degree Celsius) it is solid due to the high pressure about 3-5 million atmospheres. The surface layer is called Crust and is only some 5-15 km, 3-9 miles thick. It consists of rigid plates that move because of the currents in the mantle.
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