Hi all -- There are lots of different recipes online for volcanoes... I've nver made one and my 3rd grade teachers want me to push in and for each table of kids to make their own volcanoes over the next 2 or 3 weeks. I don't want a huge disaster or mess so I'm hoping that someone on here has a great, surefire recipe that won't need to be done outside... I'd appreciate any and all help!! Thanks!