Earth is made up of four different layers; the inner core, core, mantle and crust. Creating a drawing of the layers of the Earth is so simple, it is literally a circle within a circle within a circle. To spice up the drawing, fill in the different layers with bright colors and different textures to emulate what each layer is made of.
Draw a large circle. Draw another circle just inside of the first circle.
Draw a small circle in the center of the first two circles. Draw one last circle equally in between the the center and the first two circles.
Label the rings inner core, core, mantle and crust, starting with the inner-most circle.