Marvelous information/story, well told. I love the organization into chapters: blue planet, grey planet, black planet, and so forth. Geology was not dumbed down but very accessible.
His voice and intonations are wonderful, but it was very very disconcerting that he absolutely butchered the pronunciation of many of the geological terms. Planetesimals, isostacy, many others. If you are going to perform a geology book, wouldn't you want to be sure how to pronounce the words first?