Graham Shields

This book takes the reader through the complete weathering cycle, from the continents to the oceans, from the perspective of modern radiogenic isotope geochemistry. Meer

An exploration of how the Cryogenian Period, when our planet was covered in ice for millions of years, created today’s remarkable biodiversity   More than half a billion years ago, our world was completely covered by glaciers, a “Snowball Earth” that persisted for millions of years. Meer