Water covers 70% of the Earth's surface, which is why Earth is often called the "Blue Planet." However, fresh water is a very precious resource, and without it, plants animals and humankind cannot exist. From underground reservoirs to the polar ice caps, this book explores how the water cycle works. Find out how water shapes our landscape, how we can save water in our daily lives, and how global warming will change our oceans. Packed with awesome photographs, easy-to-understand diagrams, and with some simple experiments to try, readers will learn all about what makes Earth the "Blue Planet."