A hollowed out volcano for kids' eruption experiments! 

It hold appx 38oz of liquid. 7 year old for reference.

Vinegar and Baking Soda are more “explosive” and instant, but for a longer, more “volcanic” eruption, I recommend the Elephant Toothpaste process involving hydrogen peroxide and yeast.

I rounded the inside to prevent anything getting stuck inside and to make it easier to clean.