NeoSCI Smithsonian Volcano Activity Model measuring 12 in x 4 in is a realistic model that safely and easily demonstrate the principles of volcanism by erupting internally, like a real volcano. Model can be set up in less than twenty minutes and is completely safe with no heat or flame. The eruption and continuous foaming action of the model can be controlled by hand pressure using the unique bottle and tube delivery system. Model comes with the actual volcanic rocks with interesting facts. Model is accompanied by comprehensive, fully illustrated teacher and student literature including detailed reference information on volcanoes as well as step-by-step operating instructions.