. . . "Juvenile works" . . . "Explores the importance of water to everything on Earth, the water cycle, the ways in which water gets used--and wasted, pollution, water shortages, and efforts to purify and preserve water." . . . . . "Describes the importance of clean water, the causes of water pollution, the water cycle, and how people can conserve water." . . . . . "Saving water" . . . .