These books in the Earth's Ecosystems series manage to stuff quite a lot of information into 32 pages. Each book covers one general type of ecosystem, and most also cover specific examples that fall under the larger category. Tundra Ecosystems, uniquely for the series, focuses on one fairly uniform biome, distinguishing only particular features of the Arctic. The books' relatively dense text is broken up by a photo or diagram on each page as well as numerous fact boxes. Some of the fact boxes lead, somewhat confusingly, with a numerical statistic that is explained below, along with several vaguely related bullet points. Other boxed features are clearer, including "Think about It" questions addressed directly to the reader. Overall, the books' rich level of detail and information will likely appeal to upper-elementary readers.