Sedimentary Rocks

The teacher, or student volunteer, will mix a batch of soil, sand, and a few small rocks. Small quantities of the mixed substance will be put in a jar and water added. Shake the jar and let the various material settle into the layers. This will show the way a sedimentary rock forms. Of course, this rock will never harden into a real rock the way sedimentary rocks form, but it shows why these rocks are in layers.