Gr 3-5-This series explains how many natural and some man-made phenomena occur. Information is clearly presented using a large font, diagrams, and photographs formatted to resemble Polaroid pictures. Historical background, such as ancient Greek beliefs about lightning (Cloud), is included where relevant. Both benefits and pitfalls are presented as needed. For example, in Electricity, the benefits of hydroelectric power are explained, as are the potentially negative environmental consequences of dam construction. This series does a first-rate job answering some important scientific questions.[Page 40]. Copyright 2008 Reed Business Information.