The OU text books are of the highest standard. This book is part of one of their courses and I would recommend it to anyone who is interested in gaining knowledge of how the Earth works in general. The text is written in a very straight forward manner that is easy to read and easy to understand. The authors have written it in such a way that some very complex issues are explained in as simple a way as possible. Each chapter builds on the last one until in the end you can fully understand a whole range of complex interlinked systems of life and Earth.