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 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.