Get ready to dig deep, gang, and join us on a fascinating journey to the centre of the Earth…

The secrets buried inside our planet are revealed by recording and studying things called seismic waves. Caused by things like earthquakes, explosions and the movement of our oceans, there are two types of seismic wave – a shear wave, which won’t travel through liquid; and a pressure wave, which moves through both liquid and solids. These waves show that the Earth is made from five layers: the inner and outer core, the lower and upper mantle, and the crust.


Β 

Check out our magazine!

National Geographic Kids is an exciting monthly read for planet-passionate boys and girls, aged 6-13!

Packed full of fun features, jaw-dropping facts and awe-inspiring photos – it’ll keep you entertained for hours!

Find our magazine in all good newsagents, or become a subscriber and have it delivered to your door! Ask your parents to check out the ‘Subscribe’ tab on our website!

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Β 

structure of the earth

Inner Core

Temperature:Β 5,000Β°C – 6,000Β°C
State: Solid
Composition: iron and nickel

The Earth’s inner core is a huge metal ball, 2,500km wide. Made mainly of iron, the temperature of the ball is 5,000Β°C to 6,000Β°C – that’s up to 6,000 times hotter than our atmosphere and scorching enough to make metal melt! The metal at the inner core stays solid because of the incredible pressure surrounding it.

Outer Core

Temperature: 4,000Β°C – 6,000Β°C
State: Liquid
Composition: iron, nickel, sulphur and oxygen

This liquid layer of iron and nickel is 5,150km deep. The outer core flows around the centre of the Earth, and the movement of the metals creates our planet’s magnetic field.

Lower Mantle

Temperature: 3,000Β°C
State: solid
Composition: iron, oxygen, silicon, magnesium and aluminium

The lower mantle is found between 670km and 2,890km below the surface, and is made from solid rock. The rock is hot enough to melt, but is solid because of the pressure pushing down on it.

Upper Mantle

Temperature: 1,400Β°C – 3,000Β°C
State: liquid / solid
Composition: iron, oxygen, silicon, magnesium and aluminium

This layer is up to 670km below the Earth’s surface. The lower part of the upper mantle is made from both solid and melted rock (liquid), while the rock in the upper region is stiffer, because it’s cooler.

Crust

Temperature: Around 22Β°C
State: Solid
Composition: Oceanic crust made up of iron, oxygen, silicon, magnesium and aluminium.
Continental crust made up of granite, sedimentary rocks and metamorphicΒ rocks.

The Earth’s surface is covered by its thinnest layer, the crust. Land is made of continental crust, which is 8km to 70km thick and made mostly from a rock called granite. The layer beneath the ocean bed is made of oceanic crust, which is about 8km thick and made mainly from a rock called basalt.

structure of the earth

Β 

structure of the earth

By studying rocks and meteorites (rocks from space), scientistsΒ believe the Earth isΒ about 4.5 billionΒ years old!

Illustration: Getty Images UK
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