This art project will be helpful to school children, as it allows them not only to see, but even touch, some of the soil layers' components. Small stones, tiny pebbles, sand and leaves will be needed for this project, as well as a thin piece of cardboard and glue. Children must draw the lines first, between the O, A, E, B, C and R horizons and then glue the appropriate components on each layer. Small stones will be placed on the bottom (R) horizon, while a combination of tiny stones and sand will be scattered for the C,B and E horizons. On the A horizon, only sand with tiny bits of leaves will used. For the top (O) layer, scatter bits of green leaves.
The soil's different layers were formed over millions of years. What is the regolith level (C horizon) today used to be the surface when, for example, dinosaurs were living on Earth. Make a drawing of each of the soil's layers, inside of which you will also depict the possible residents of Earth during the time the layer was at ground level. You can start from dinosaurs and move on to apes and primitive human beings, like homo erectus.
Take an empty jam jar and remove the labels. After you wash it clean, create the different soil layers, starting from the bedrock, for which you will use small stones, then mix sand with tiny pebbles for the regolith, subsoil and eluviation. For the top soil, use bits of leaves. The layers' size is not the same, so make sure you consult a reference book or an encyclopedia to depict these layers accurately.
During this art project, you can combine the different soil layers, with a hypothetical underground settlement. The cause of the bunker's creation can be war, a natural disaster or just act as another form of urban extension. These causes have to be depicted above ground level. The bunker can be structured as an ant colony, but must reach only until the B horizon (mostly sand and small rocks), since it's impossible to penetrate bedrock.