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Interior Of Our Earth

Just like an onion, the earth is made up of  several concentric layers.

"There are three main layers of the earth's surface" They are,

1. Crust
2. Mantle
3. Core

Crust:

              The outermost layer of the Earth.  It is the thinnest layer of the earth.  It is approximately 35 km thick beneth the continental masses and 5 km thick beneath  the ocean basins. 

               The major mineral  found in the  continental crust are silica and aluminum, collectively referred to as sial (si-silicon, al-aluminium).

                The major mineral found in the oceanic crust are silica and magnesium, collectively referred to as sima(si-silicon, ma-magnesium).

Mantle:

                  It lies just beneath the Earth's crust, and it's thickness is approximately 2,900 km.

Core:

                It is the innermost layer of the the Earth, with a radius of approximately 3,500 km.

                The major minerals found in the core are nickel and iron, commonly   referred to as NiFe (Ni-nickel, Fe-iron). 

                The core is characterized by extremely high heat and pressure.