Our world is made up of five layers.
On the outside is a layer of gases – our atmosphere. Next comes a liquid layer of water – seas and oceans. Below this lies the Earth’s crust which, in places, rises through the water to produce the continents and islands we recognise today.
This sits on top of an enormously deep layer of semi-molten rock – the mantle – that surrounds the Earth’s core. The core is made of metal, mainly iron, and divided into a solid inner core and a liquid outer core. Currents circulating in the outer core generate the Earth’s magnetic field
