The interior of the Earth is consisted of three major parts. The crust runs to around 64 kilometres deep into the Earth, followed the mantle, which is 3000 kilometres. Underneath the mantle, is the outer liquid core that surrounds the inner solid core, which is 3500 kilometres thick.

The Earth’s crust is what we are all familiar with. The crust runs to a depth of 64 kilometres, however, underneath some undersea areas, it can be as shallow as 12 kilometres. Geologists believe that the crust is divided into two layers – the sialic layer, and the simatic layer. The sialic layer (It’s name is derived from silicon and aluminium) is rigid, and is believed to be floating on the less rigid simatic layer, the name of which comes from silicon and magnesium. Think of the sialic layer floating on the simatic layer rather like an iceberg floating on water.

Between the crust and the core lies the mantle, which is 3000 kilometres thick. Geologists, using evidence from changes in the speed of earthquake shock waves, have shown that the mantle could be made up of minerals containing iron and magnesium. While the mantle is solid, it is more similar to the simatic layer, in that is in a plastic state, like putty. The mantle’s shape can change due to changes in pressure from the crust and from the effects on internal temperature changes.

Finally, there is the core, which is divided into two sections – the 2000 kilometre thick outer liquid core, and the 1500 kilometre inner solid core (Geologists were able to determine this by observing earthquake shock waves).