Mountains are extraordinary biomes that are home to diverse ecosystems. Discover the features that make up a mountain, where in the world mountains are found, and the hardy organisms within their food chains and webs. In this book, readers will discover every aspect of the mountains that reach to our skies, from their foothills to their sky-scraping peaks. They'll learn about the many amazing plants and animals that live on mountains and the systems they use to survive these tough places. Why mountains are under threat is also revealed, along with actions that can help protect them.