Structure of the Earth!
Join us on our journey to the centre of the Earth!
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 β 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
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Β
Inner Core
Temperature:Β 5,000Β°C – 6,000Β°C
State: Solid
Composition: iron and nickel
The Earthβs 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 β thatβs 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 β 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 planetβs 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 β 3,000Β°C
State: liquid / solid
Composition: iron, oxygen, silicon, magnesium and aluminium
This layer is up to 670km below the Earthβs 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 itβs 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.
Β
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