Abstract: "The purpose of this book is to provide an accessible introduction to geosciences for a wide range of students and lay persons. This is a practical book for those who want to understand the earth, without the need to become scientific experts. It will provide readers with a quick, basic grounding in the principles and science, and explain how to apply the information in a practical way. The Geology Companion is both a reference and a guide to understanding the earth and its geologic processes, and how they affect people in their daily lives."--Provided by publisher