How to Make Volcano

I learnt these simple experiment for a science exhibition at a primary school in Subang, SK Subang Bestari. Alhamdulillah, we managed to to get positive results.

How to Make a volcano

How to Make Glow In the Dark Liquid

However, I still don't really understand the concept of the physical process. How it works? What process involved? Gotta find the answer in the web.
The mixing of vinegar and baking soda causes a chemical reaction that produces carbon dioxide (which is the same gas emitted by the real volcano). Lets find out the chemical reaction involve.