Make an illustration of a cross-cut of the earth. Use a ruler to assist in the measurements. Approximate the sizes of the earth's layers, and resize them to inches by moving the decimal to the left. The size of the illustration is only limited to the available wall space and the available size of paper. If large enough, make it a group project.
Study how seismic waves are used to determine what the center of the earth is like. Scientists studied how certain seismic waves refract when they encounter certain substances. By watching what happened when seismic waves traveled, they are able to make educated surmises about the interior.
Experiment with designing a seismograph. Next to your ultimate design set up a placard on the history of the study of the core through seismic waves.
The earth's core is larger than both Mercury and Mars. Create scale models of these planets to show the size difference. Mediums range from illustrations or by making clay models and poking a hole on one of their ends, baking them, setting them on skewers and then setting them side by side on floral foam or a tub of sand.
The Earth's magnetic field keeps solar radiation and winds away from the earth's surface. People use it for when they want to use a compass and a directional satellite. The core of the Earth can be compared to the actions of a bar magnet. Create a demonstration using bar magnets. Use iron filings and show the patterns formed around the magnet. Compare the magnetic fields of the iron magnet to a diagram of the Earth's magnetic field.
On a tri-fold poster, draw a cutaway diagram of the Earth, drawing lines pointing to each section, each with the appropriate name for the section it points to. Write down various facts on the core, such as its composition, averaged temperatures, what the various parts are made of and the amount of pressure exerted in each layer. On one section, include brief descriptions of past theories on what the earth's core was like.