I was at my sisters house where she had a list on her fridge of fun things to do with her children. On the list was "volcano". I asked her how. It is a base (Baking Soda) reacting with an acid (Vinegar). Put them together and you get a volcano. In a cup/glass (put some tin foil around the glass to give it a volcanic look) add baking soda (about 1/4 cup). Then pour in a small amount of vinegar and it will create a reaction of bubbly liquid. Carbon dioxide is given off in the process, creating the fizzes, pops and crackles. I had a good time with my children. We had to do it a few times.
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