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Crust. This layer consists primarily of aluminium silicates There are two types: continental crust and oceanic crust

Mantle. This layer is made up of gneous rocks rich in iron and magnesium silicates. One is peridotite, which consists primarily of the mineral olivine.
It is divided into the upper mantle and lower mantle, which are separated by the transition zone Here, the physical properties of the rocks of the upper mantle are changed due to the increase in pressure and temperature, resulting in denser materials.

Core. This consists of almost pure iron mixed with a small percentage of iron sulphides and nickel.
It is divided into two parts, each in a different physical state
.The outer core is liquid. It has a consistency similar to water VIolent convection currents here generate the Earth's magnetic field or magnetosphere
The inner core is solid.

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Different Models Of the Internal Structure of the Earth 

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Different Models Of the Internal Structure of the Earth 

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Nowadays exist two types of models of the Earth.
-The Geochemical Model which is based on the chemical composition of the internal layers of the Earth. It divides into three layers and three seismic discontinuities.
-The Geodynamic model which is based on the physical state of the layers and the mechanical properties of the Earth.

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The lithosphere consists of the crust and the uppermost part of the mantle. It is dragged along by the movement of the mantle underneath. As a result, it has been fractured into large blocks called lithospheric plates. These plates fit together like a jigsaw puzzle, and are subjected to twO types of movement Horizontal movements due to plate tectonics. Vertical movements due to isostatic adjustment.

Asthenosphere or sublithospheric upper mantle.
This layer lies between the lithosphere and the mesosphere. Scientists believe it coincides with the lower part of the upper mantie. It is a plastic malleable layer with a tendency to flow as the lithosphere moves.

Mesosphere
Ine mesosphere is the lower mantle, it extended from a depth of 670 km to the "D" layer, which is solid, the mesosphere is not static, it moves very slowly: a few centimetres pear year Cold lithospheric plates from the subduction zones.

The D layer is one of the most dynamic layers of the Earth. Heat from the outer core accumulates here, and hot magma escapes from this layer as mantle plumes The plumes break through the lithosphere, creating hotspots: areas of intense volcanic activity, Such as the Hawaiian Islands.

The core
In both the geochemical and the geodynamic models, the core consists of two parts: inner and outer. The heat in the solid inner core spreads to the liquid outer core. This generates convection currents that push heat out of the core into the D" layer, where it accumulates.
These convection currents also generate the Earth's magnetic field.