For most people, climbing the largest mountains in the world is a once-in-a-lifetime opportunity. For mountain guides, it's just another day at work! In this book, readers in grades 4-8 will meet the people who risk their lives to help others have adventures on the highest peaks. This high interest, low reading level series gives readers an exciting photo- and fact-filled look at some of the most dangerous jobs on the planet. Each book features stand-alone spreads, so readers can flip pages and read in any order. Glossary words are defined on the page where they appear, boosting reader comprehension