Add vinegar
you can use Mentos and baking soda
Baking Soda is most likely the answer to this question.
You need to add carbonated water .
Because of the preasure.
Fizz
To make a volcano using baking soda, you will need a container, such as a plastic bottle or a cup, and some baking soda. Fill the container with baking soda, then add vinegar to create a chemical reaction that will cause the baking soda to fizz and overflow like a volcano. You can also add food coloring or dish soap to make the eruption more visually appealing.
If you look at the ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate(baking soda). When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz.
put vinegar and baking soda into a bottle, then put the cork in quickly, and the cork will go flying out along with a lot of fizz and bubbles
Baking powder has tartaric acid in already.
It is giving off carbon dioxide gas
Add baking soda (watch out, it will fizz.)
because there is a bouncy ball