The book looks at several aspects of oceanography, from astronomical origins through biology to climate effects. It ramps up in complexity & the last chapter on currents, heat transfer, glacier & sediment cores, and climate was fascinating. This book isn't as light-hearted as Mary Roach's style, but it had moments of gentle humor. Some of the info in this referenced book is fairly alarming, w/o being alarmist, informing w/o being political. Good science writing. Really cool stuff about the interactions & modeling of things like ocean currents, salinity, atmosphere, glaciers, phytoplankton, CO2, etc etc. A geeky pleasure read.