This book is a comprehensive introduction to physical geology. Schuchert and Pirsson cover all the key topics, from plate tectonics and volcanoes to earthquakes and the rock cycle. They provide clear explanations and diagrams to help readers understand the science of geology. The book is aimed at students of geology, but will also be of interest to anyone wanting to learn about the natural world. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.