PHYSICAL GEOGRAPHY, Ninth Edition, uses the combined expertise of four respected geographers to show how Earth?s physical geography impacts humans, and how humans impact Earth?s physical geography. The text emphasizes three essential themes to demonstrate the major roles for the discipline -- Geography as a Physical Science, Geography as the Spatial Science, and Geography as Environmental Science. With a renewed focus on examining relationships and processes among Earth systems, this text will help you understand how the various systems interrelate and how humans are an integral aspect of geography. Historically the first book to take a conservation approach, the authors continue to emphasize the theme of environmental and human impacts.