Water. It is the most common substance on earth and the only one necessary to all forms of life. Although the earth’s supply of water remains constant, only three percent of it is fresh, and two-thirds of that is locked up in the form of ice. Thus, plants, animals, and an ever growing number of people depend on that remaining one percent. This set of 40 transparencies uses photographs and artwork to illustrate basic scientific concepts such as the water cycle, the structure of a water molecule, how water reacts at different temperatures, and water as an agent of weathering and erosion. This PicturePack also shows how people throughout the world use and abuse water.
ISBN: 0-7922-3233-X
Copyright Date: 01-FEB-98
U.S. Price: $49.94
Canadian Price: $68
