Almost every stretch of open water on Earth is home to some kind of life. About 97 percent of Earth's water is salt water. Learn more about Earth's water in this book.

Includes index.

Studying oceans, lakes, and rivers -- Salt water and fresh water -- Ocean zones -- Humans and water -- Glacier movement -- Oceans, lakes, and rivers around the world -- Lakes and rivers -- Underwater life -- Protecting the world's water -- What is an oceanographer? -- Oceans, lakes, and rivers quiz -- Science in action.