Amazon.com description: Product Description: Now in a new edition, this book is fully revised from previous issues and includes four main themes that run throughout the text: plate tectonics; earth as a system; natural disasters; and human-induced environmental change. These four themes provide a better layout and cohesive approach. Furthermore, the text is enhanced with fifty percent of the illustrations replaced and improved, and more art and photos. This new edition restores balance by providing greater attention to paleomagnetism and its use in deciphering past plate motions.