magma?

In a discussion today with my four students, we were brainstorming 'things on the Earth that are important to us'. Some responses were food, animals, shelter, water and electricity/oil (with a bit of prompting!). Of course, there had to be an answer that stood out in this discussion. The winner: magma.

Yes, one of my students figures that magma is really important to our well-being. I wasn't about to argue. That answer would have taken some serious thought!