A childhood belief about landscape

I devised a huge theory of what the earth is composed of simply because of the word 'lavatory'.

In first grade, our teacher would line us up to go to what she called "the lavatory". I had never heard a bathroom called such a thing, and I immediately understood that I was uncovering some ancient science that only I knew: lava was made of wee and poo and that in going to the bathroom, we were in fact "making lava". I was very smug about this hidden knowledge.

The next year, we learned about the layers of the earth, and of course "lava" was just another word for #1 and #2. All the plumbing must reach below the Earth's crust and pour all the "lava" into this ever-expanding pocket of sewage! I was always afraid of digging holes because I thought if I dug too far, the world would be flooded in poop. Volcanoes were disgusting, and I was very grateful that I didn't live anywhere near one.