In this series, mountains are the topic as one of the endangered biomes.  “A biome is a large natural area with a distinctive climate and geology”.  Plants and animals that live in mountains have adapted to their habitat.  The delicate balance within the ecosystems can be, and are, easily disrupted by nature and people.  Without people becoming more aware of conservation and preserving our biomes, the future of our mountain biomes is threatened.  Today, some plants and animals are rarely found and in danger of extinction.  The message of the book gives one pause to consider how to effectively safeguard our planet’s biomes.  Words to know are written in bold text and defined in a box on the page.  The glossary contains the same words.  Clear, colorful photographs are well-chosen and labeled.  Other books in the series are: Deciduous Forests, Coniferous Forests, Deserts, Grasslands and Savannas, Oceans, Tundra, and Rain Forests.  An index and extensive resource list are in the back.