How to Build a Volcano
First, make the “cone” of the volcano. Mix 6 cups flour, 2 cups salt, 4 tablespoons cooking oil and 2 cups of water. The resulting mixture should be smooth and firm (more water may be added if needed). Stand a soda bottle in a baking pan and mold the dough around it into a volcano shape. Do not cover the hole or drop dough into it. Fill the bottle most of the way full with warm water and a bit of red food color (can be done before sculpting if you do not take so long that the water gets cold). Add 6 drops of detergent to the bottle contents. Add 2 tablespoons baking soda to the liquid. Slowly pour vinegar into the bottle. Watch out – eruption time!