A comprehensive introduction that focuses on all of the major scientific processes of physical geology. Researched and written by two eminent geologists, the third edition includes new overarching themes of environmental issues and human interaction with the earth and its resources. Each chapter begins with an essay on this subject. Each part ends with a guest essay on the good stewardship of the Earth--how we can take care of our planet. The art program has been revised with 40% new art throughout to reflect current research.