What you need for this experiment

Sand
Baking Soda
Vinegar
Empty Bottle
Food Coloring
Dishwashing Soap
Funnel

Experiment Directions

Form your volcano out of the sand.  You may need to use some water to help it stay together.
Make a hole in the top.  Place bottle in the hole. 
Add some food coloring to your vinegar.  This isn't necessary for the reaction, but makes it more fun!
Place tablespoons of baking soda in the bottle in your volcano.  You will probably want to use a funnel for this!
Add vinegar to the bottle. Experiment with different amounts of baking soda and vinegar to see what happens. 
Next, try it again but add some dishwashing soap to your vinegar before adding it to the baking soda. 

Why does it do that?

Baking soda and vinegar react with each other because one is an acid (vinegar) and the other is a base (baking soda). This is called an acid-base reaction.  Baking soda is sodium bicarbonate (NaHCO3) and vinegar is acetic acid (HCH3COO).   When you put the two together, the reaction produces sodium acetate (NaC2H3O2) , water (H2O), and carbon dioxide (CO2).  It is the carbon dioxide bubbling up that produces the "erupting" effect.  Adding the dishwashing soap produces a more dramatic eruption due to the escaping carbon dioxide "blowing bubbles" in the dishwashing soap.

Erupting Sand Volcano
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