Earth's geography might seem unchanging, but it's changed greatly over the years. Some of the most obvious changes have taken place on Earth's coastlines, where the consequences of human activities are seen in a number of ways. This book explores the different ways Earth's coastlines have changed and why these changes have taken place. Through fact boxes and sidebars, readers will also learn about how people can help prevent these changes from continuing. Full-color photographs further depict the changes to Earth's coastline environments.