There are four distinct layers:
This is the centre of the Earth. It is solid, made of iron and nickel. The temperatures in the inner core can reach 5500C.
The outer core is as hot as the inner core. However, there is one difference: here the iron and nickel are molten. This is the layer surrounding the inner core.
The mantle is the widest part of the Earth. The mantle is made of semi-molten rock called magma. In the upper parts of the mantle the rock is harder, but nearer the inner core, the rock is softer and beginning to melt.
The crust is the outer layer of the Earth. It is made up of two different types of crust: oceanic crust (carries water) and continental crust (carrying land).
See main article crust.