Forests are generally defined as thick growths of trees and underbrush covering an extensive tract of land. They are found in places with temperate climates. But tropical rain forests flourish along the equator and boreal forests grow in the cold, dry North. There are jungles and mountain forests. Using simple, declarative sentences, the author describes them and their inhabitants. Readers learn that forests have a far-reaching effect on Earth's weather, but forests are becoming endangered as humans decimate their valuable resources. The book's dynamic format and beautiful photographs, its most visible assets, are complemented by its surprising amount of information. A page of "Amazing Facts" and a detailed index at the back are a bonus. The book is wonderful introduction, likely to encourage readers to learn more on their own. It is part of the "Science Files: Earth" series. 2004, Gareth Stevens Publishing, Ages 8 to 12.