Place your small cup in the center of a large tray or baking sheet. I definitely recommend doing this activity over a tray because the volcano can overflow quickly once the reaction starts.

Cover the cup with aluminum foil, shaping the foil around the outside so it looks like a little volcano. Cut a hole in the top of the foil about the same size as the opening of the cup. Make sure the opening is large enough to easily add your ingredients.

Add 3 tablespoons of baking soda to the cup.

Next, add 4 to 6 drops of food coloring. Red or orange is fun if you want it to look more like lava, but any color works.

When you’re ready for the eruption, slowly pour in about 1/2 cup of white vinegar. The mixture will immediately start fizzing, bubbling, and overflowing out of your volcano.