Science Experiment

In year four at primary school I remember doing a science experiment. The science experiment we did was the baking soda and vinegar volcanon in the sand pit. I remember Making a volcano out of sand and putting a tunnel down the middle. We then put baking soda down the middle. After the teacher told us to watch as he poured in the vinegar, Suddenly a big rush of white foam came flying up the top.  when the vinegar hits the baking soda a reaction is caused and it creates foam