Earth is covered in water. Yet, just a tiny amount of that liquid is actually fresh water. From rivers and lakes, to vast ice sheets and glaciers, this book examines fresh water—one of Earth's most important resources. Inside this book, readers will learn about the differences between fresh water and salt water. They'll also learn the answers to these questions: Where can liquid fresh water be found on Earth's surface? Is it true that most of Earth's fresh water is either solid ice or underground, deep beneath our feet? Why is water so essential for life on Earth? And what can we do to protect our precious supply of fresh water? Filled with information perfectly suited to the abilities and interests of an early elementary audience, this colorful, fact-filled volume gives readers a chance not only to learn, but also to develop their powers of observation and critical thinking. With its stunning photographs and surprising, high-interest facts, this book makes learning about water an engaging experience.