Safely and easily demonstrate the principles of volcanism with a realistic model which erupts internally—just like a real volcano! Completely safe with no heat or flame, set up in less than twenty minutes. Eruption and continuous foaming action can be controlled by hand pressure using the unique bottle and tube delivery system. Includes fully illustrated teacher and student literature; detailed reference information on volcanoes; as well as step-by-step operating instructions. Size is 12"D x 4"H. Neo/Sci®