Structure of the Earth

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by kajal1010shivani

by kajal1010shivani

There are three parts of the Earth:
Crust ( outer layer of the Earth )
Mantle ( middle layer of the Earth )
Core ( innermost layer of the Earth )

Crust:
Also called lithosphere. Has two distinct subparts: sial (silicone plus aluminium) and sima (silicone, iron and magnesium).
sial comprises of granite rocks and sima comprises of basaltic rocks.
sial is less denser than sima.

Note:
crust is in two forms of the Earth, continental( mostly sial ) and hydrosphere when water is over sima. And above crust in air we have atmosphere.

Mantle:
middle layer of the Earth.
It is made up of very dense rocks rich in olivine (magnesium iron silicate)

Core:
innermost layer. Made up of mainly nife (nickel and iron).
Also called barysphere.
The innermost part of the core is solid or crystalline even afterhaving a great temperature.
Core has high temperature and high pressure.

Sources of these information in geography for scientists : volcanoes, earthquakes, deep mine operations and crustal borings.