What Will Rick Sanchez, CNN's Mr. Wizard, Discover Next About Science?

On April 15, CNN anchor Rick Sanchez, the network's Mr. Wizard, suggested Iceland shouldn't have a volcano: "You think it's too cold to have a volcano there." On Friday, Sanchez followed up with this:

Chad, we've had some e-mails today asking if I've heard of submarine volcanoes. All I can say to that is wow, that is a unique way to power a submarine. How do the engineers start a fire hot enough to melt the rocks? And once that lava starts bubbling and splashing around, isn't it a little scary to be hanging around in the boiler room?