She decided to do a volcano this year. Since there needed to be an actual experiment involved she decided to try 2 different ratios of water, and the vinegar/baking soda mix.
And sure enough....the more of the baking soda/vinegar used the bigger the eruption! Science is fun :)
This year's science fair was especially fun because of the little "stations" set up around the gym for the kids and their siblings to try other small experiments. We actually had a lot of fun.