Unity Ceremonies and Science

I just ran into this fun idea for a unity ceremony. I don't know that I will ever use it for that since I don't plan on having a unity ceremony anytime soon but it would also make a great science experiment. Yes, I know the old volcano thing isn't such a big deal to most of you but my kids haven't seen it yet and I know it will be a big hit! There has been a lot of fighting at my house recently and what a great way to show them that if they work together they can do fun things. I wish I would have thought of this a little earlier and I would have gotten the things while I was at the store tonight. I suppose it shall wait for tomorrow...