In the early part of the 20th century, geologists studied the tremors (seismic waves) generated by earthquakes to learn more about the structure of the earth's interior. They discovered that it is made up of 4 different layers: the crust, the mantle, the inner core and the outer core.
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 5,000°C.
The outer core is the layer surrounding the inner core. It is a liquid layer, also made up of iron and nickel.
The mantle is the largest section of the Earth.The mantle is made up of semi-molten rock called magma.
The crust is the outer layer of the earth.
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 5,000°C.
The outer core is the layer surrounding the inner core. It is a liquid layer, also made up of iron and nickel.
The mantle is the largest section of the Earth.The mantle is made up of semi-molten rock called magma.
The crust is the outer layer of the earth.