Ingredients you will need:
    vinegar
    baking soda
    empty toilet paper roll
    cookie sheet
    tin foil
    food coloring (optional)
 

        Place empty toilet roll on cookie sheet. Stuff tin foil in one end of the tube. Make sure the other end has enough room for the baking soda and vinegar. Then line both the outside and the inside of the tube with tin foil. (If you want, you can make a mountain on the outside of the tube for effect.) Now you are ready to begin the fun part! Put 1/2 cup of vinegar in first (if you put in the baking soda before vinegar it will not work.) Then add 4 Tbsp. of baking soda. (Add food coloring if you wish.) Move away and watch it erupt!!