Depicting the Earth's layers as a 3-D model can be done using paper mache, or in a fun, edible cake form; however, using modeling or Baker's clay are more common methods. The following steps outline the procedure for using Baker's clay.
- The Baker's clay should first be split into the following relative proportions (using a meter stick or ruler to measure): 0.7 percent for the inner core; 15.7 percent for the outer core; 82.0 percent for the mantle.
- Next, each of these volumes should be rolled into a sphere.
- The outer core sphere should be cut in half and, using the fingers or thumbs, a dip large enough to accommodate one half of the inner core sphere should be pressed into each of the outer core halves.
- The process is then repeated for the mantle, which should house both the outer and inner cores when pressed back together.
- The resulting structure is then to be cut in half and baked until dry in a 200 degree Fahrenheit oven.
- The crust would be far too thin to model at this scale, so it should be painted on when the model is dry.