Most of Earth is covered with water, but we can only consume a small percentage of that water. What Is Water Worth? informs readers about three big challenges to our water supply: pollution, population, and climate change. It also offers some ideas about how we can work together to ensure a safe global water supply for generations to come. Photographs, charts, and diagrams support the text. This book can also be used to teach students to determine the author's purpose and to identify compound words. Book and lesson are also available for Levels W and Z.