How does a volcano for a science fair work?

In this video it shows me how to make a Volcano but what is the science behind it? <http://www.youtube.com/watch?v=9b_gltKtERY>




The food color-dyed water is just there to add volume and color. 


The household chemicals used are acetic acid (vinegar, $\ce{CH3COOH}$) and sodium bicarbonate (baking soda, $\ce{NaHCO3}$). 


The acetic acid and sodium bicarbonate react to form carbon dioxide gas ($\ce{CO2}$), dissolved sodium acetate ($\ce{CH3COONa}$) and water ($\ce{H2O}$). **It is the liberation of $\ce{CO2}$ gas that causes the foaming and bubbling**.


The chemical reaction is written as: 


$$\ce{CH3COOH(l) + NaHCO3(s) -> CH3COO-(aq) + Na+(aq) + CO2(g) + H2O(l)}$$ 


Where:  

l = liquid  

s = solid  

aq = aqueous (dissolved)  

g = gas (vapor)


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