Internal Structure of Earth

Lets learn about the Internal Structure of Earth, step by step:

How  Internal Structure of Earth has been categorized ?

The internal structure of earth has been divided into following parts, namely :

Core

It extends from 2900 km- 6370 km.

It contributes to 16% of Volume & 32% of mass of earth.

It’s gravity is greatest due to its domination of heavy metals, Nickle & Iron.

Core is further divided into Outer Core and Inner Core.

Outer Core (2900 km- 5150 km )

It is in liquid state and has a density of 5 g/ Cm3

Inner Core(5150 km- 6370 km )

It is in solid state and has a density of 13 g / Cm3

Why Inner Core is in solid state while outer core is in liquid state?

Melting Point of inner core is high due to its High pressure, so inner core is in solid state while outer core is in liquid state.

Mantle

It extends from 40 km- 2900 km.

It Contributes 83.5 % of Volume & 68 % of mass of earth.

It is in Solid State.

Mantle between 100 km from surface to 300 km in a plastic state (Semi Liquid) and is called as Asthenosphere.

Why Asthenosphere is in Plastic State?

Melting Point and Temperature in this region are in equilibrium, hence this part of Mantle is in Plastic State.

Crust

It is the outermost layer and is lightest in density (3 g/ Cm)

Crust is of two types:

Continental Crust– It is thicker and lighter in Density and is dominated by Silicon (Si) and Aluminium (Al).

Oceanic Crust– It is denser than the Continental Crust(2.7 g / Cm ) and is dominated by Silicon (Si) and Magnesium (Mg).

Internal structure of Earth

What are Transitional Layers?

Transitional Layers (Discontinuity) are the layers formed due to sudden change of the density of layer lying between Core, Mantle and Crust.

What is Guttenberg Discontinuity?

In between Solid Mantle and Liquid Core there lies an area called as Guttenberg Discontinuity (Solid). It is identified by sudden change in the density of the layer.

What is Moho Discontinuity?

In between Lighter Crust and Denser Mantle there lies an area called as Moho Discontinuity (Solid). It is identified by sudden change in the density of the layer.

What is Lehmann Discontinuity?

In between Lighter  Outer Crust and Denser Inner Crust there lies an area called as Lehmann Discontinuity (Solid).It is formed due to sudden change in the density between the two layers.

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