As a student studying marine biology I required a book that was reasonable cheap and covered all aspects of the marine enviroment, this book fulfills both of these requirements. It covers such diverse topics as coral reefs, the benthic environment, pollution, and conservation. It is very easy to read and understand, and is well illustrated including some superb colour photographs. However, you do not have to be studying marine biology to make the most out of this book, it is a thoroughly enjoyable read for anyone who has a passing interest in the subject.