People have been studying the Earth for thousands of years! This fascinating book will introduce readers to those who made big discoveries in geology. Through vibrant photos and easy-to-read text, readers will learn about such early geologists as James Hutton, William Smith, Alfred Wegener, Florence Bascom, and Friederich Mohs. The helpful charts and graphs work in conjunction with the accessible glossary and index to give readers the tools they need to better understand the content. An engaging hands-on lab activity is featured to encourage readers to explore the world of geology!