Mantle


 
 
Concept Explanation
 

Mantle

Mantle(Mesosphere): - Just beneath the crust is the mantle which extends up to depth of 2900 km below the crust. It is divided into the upper mantle and the lower mantle.

The upper mantle is a thin, stiff layer consisting mainly of the minerals silica, iron and magnesium. It extends from the bottom of the crust to a depth of around 300km.

The lower mantle extends from around 300 to 2900km. It is a zone of mixed minerals such as iron, magnesium, aluminium and silicon. The lower mantle is made up of molten material called magma, which flows out as lava during volcanic eruptions.

 
 


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