Life as we know it would be impossible without water. Luckily for us and the other organisms with which we share our planet, Earth has so much water that it is sometimes known as "the water planet." This engrossing volume describes where water can be found in its solid, liquid, and gaseous states. The book offers the details of Earth's water cycle and highlights the importance of both freshwater and salt water. It also tackles the unpleasant but pressing topic of water pollution. Readers will love the beautiful photographs of rivers, lakes, oceans, and more.