Internal Structure of Earth

Earth has a diameter of about 12756 km at equator & about 12714 km at the poles. The Earth’s interior consists of rocks & metals & has 4 layers.

1. The Crust or the top layer of the earth.

It sustains life on the earth. It is made of igneous rocks, metamorphic rocks & sedimentary rocks. The crust is made of 2 layers—

(1) outer layer orsial which is made of silica & aluminum

(2)  inner layer or sima made of basalt & magnesium.

2. Mantle

Mental is the 2nd Layer of the earth made of silicate rocks rich in iron & magnesium. The mantle is divided into upper mantle and lower mantle.

Upper mantle consists of lithosphere & asthenosphere. Lithosphere is the hard rock layer of the mantle& the asthenosphere hemisphere is made of viscous yet solid rock.

3)Outer core –

made of liquid iron & nickel.

4)Inner core-

innermost & deepest Layers It is extremely hot with high pressure and this causes the contents of the inner core to remain solid.

Facts:-

The crust forms only 0.5 % of the volume of the Earth, 16% consists of the mantle & 83% makes up the core.

The radius of the Earth is 6371 km

Core is also called “nife” as it made of ni-nickle & fe-iron (ferrous)

The crust of the earth is made of various types of rocks (natural mass of mineral matter).

Rocks are of different colour, size, texture.

There are 3 major types of rocks

Igneous

Sedimentary

Metamorphic

Thanks

By Krishanpal Yadav