The internal structure of earth | diagram of structure of earth

The internal structure of earth | diagram of structure of earth

The internal structure of earth | diagram of structure of earth
The internal structure of earth | diagram of structure of earth

Structure of earth | Crust

  • It Is The Topmost Layer Of The Earth With An Average Depth Of 33 Km. 
  • Its Thickness In The Continental Parts Is About 40 Km While The Thickness Of The Oceanic Crust Is 5-10 Km.
  • The Upper Part Of The Crust Is Made Up Of Sedimentary Rocks. 
  • The Continental Crust Is Made Up Of Granite Rocks While The Oceanic Crust Is Made Up Of Basalt. 
  • The Upper Crust Is Mainly Composed Of Silica And Aluminum And Has An Average Density Of 2.7. This Part Is Called Sial (Silica+Aluminium). 
  • Silica And Magnesium Predominate In The Lower Crust. It Consists Of Basalt Rocks. This Is Also Called The ‘Boundary’ (Silica + Magnesium) Layer. Its Average Density Is 3 G/Cm.
  • There Is A Lighter Layer Than The Sial Border. 
  • Thus Siel Is Floating Above The Limit. 
  • It Is Also Called Lithosphere And Has Two Parts – Outer Crust And Inner Crust.

Structure of earth | Mantle

  • Its Depth Is About 2900 Km.
  • The Mantle Represents 83% Of The Total Volume Of The Earth And 63% Of The Total Mass. 
  • The Mantle Is Also Divided Into Two Parts – The Upper Mantle Is Called The Asthenosphere, Which Extends Up To 400 Km, Which Is The Main Source Of Magma. 
  • Its Density Is Greater Than That Of The Crust (3.4 G/Cm’). 
  • The Combined Part Of The Crust And Upper Mantle Is Called The Lithosphere. 
  • It Is Mainly Extended Up To 10-200 Km. 
  • Below 100 Km And Up To A Depth Of 200 Km, The Material Is In A Molten State Where The Velocity Of Seismic Waves Decreases. 
  • This Region Is Called The ‘Division Of Low Speed’. 
  • The Mantle Is Composed Mostly Of Silicate Minerals, In Which Iron And Magnesium Predominate.

Structure of earth | Core

  • The Inner Part Of The Earth Below The Mantle Is Called The Core.
  • It Is Mainly Composed Of Nickel And Iron, Hence It Is Called NiFe (Ni + Fe). 
  • The Core Is Divided Into Two Parts – The Inner Core And The Outer Core. The Outer Core Extends From 2900 Km To 5150 Km. 
  • It Is In Liquid State. The Part From 5150 Km To The Center Of The Earth Is Called The Inner Core. 
  • It Is In A Solid State Under Extreme Pressure. 
  • The Density And Temperature Of The Core Are 13 G/Cm And 5500°C Respectively. Is. 
  • Temperature Increases With Depth In The Earth. It Has Been Proved By Applications That At Every Depth Of 32 Meters, There Is An Increase In Temperature By 1°C. Of Increase. 
  • Due To The Increase In Temperature, All The Substances In The Core Should Have Been In A Molten State, But With Depth The Pressure Increases So Much That The Melting Point Of The Substances Becomes Very High. 
  • Hence The Material Of The Core Is In Solid State. 
  • In The Outer Core, Where There Is Relatively Little Pressure, The Substances Are In A Liquid State.
ElementBurden (%)
ElementBurden (%)
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