Excellent examination of the lunatic fringe section which has insisted on a Hollow Earth since at least Halley's time. I also got this book because I'm convinced LOST is using a Hollow Earth as its "secret".
He was referencing the fun ideas of how the Earth cooled and created land/water. At least that's what I think he was discussing at the time. I find these little phrases I love and write them down. I apologize for not getting back in here very often. I don't have a ton of net access at the office.