The Earth is made up of four layers:
- The inner core is in the centre and is the hottest part of the Earth. It is solid and made up of iron
and nickel with temperatures of up to 5,500°C. With its very large heat energy, the inner core is like
the engine of the Earth.
- The outer core is the layer surrounding the inner core. It is a liquid layer, also made up of iron and
nickel. It is still extremely hot, with temperatures similar to the inner core.
- The mantle is the widest section of the Earth. It has a thickness of about 2,900 km. The mantle is
made up of magma. In the upper parts of the mantle the rock is hard, but lower down the rock is
soft and is beginning to melt. Mantle convection is when the magma slowly moves around the
earth and moves the plates also.
- The crust is the outer layer of the earth. It is a thin layer between 30-60 km thick. The crust is the
solid rock layer upon which we live.