Homeschooling Rassi boys leads to some interesting discussions...
Me: No, he is correct. Water may get dirty or change forms, but it doesn't just disappear. Remember, we also sweat out water and pee. The Earth doesn't gain or lose matter, it just changes a bit during different processes. It all evens out.
Evan: The Earth DOES gain water. Our bodies are made up of 70% water, and BABIES are born! God makes babies and they grow and all that water is added to the world! People have babies ALL THE TIME.
Me: Yes, babies are made of water, but that doesn't mean water is added. They grow by taking water out of the world, but that doesn't mean that the world will run out of water either. You have to remember that people die too. Water from those bodies returns to the ground. It all balances out.
Evan: Oh yah. People do die all the time. Wait! *holding up his glass of water* Are you telling me that I'm drinking DEAD PEOPLE?
Me: Yes. Yes, that is what I'm telling you. Glad we got that all cleared up.