Readers will delight in the high-interest educational topics addressed in this book, which is aligned to the 3rd grade Common Core State Standards for English/Language Arts. Age-appropriate language, vivid imagery, and a relatable narrative will grab students' attention, keeping them engaged while also equipping them with the skills they need to become thoughtful readers. This book provides additional learning opportunities through a graphic organizer, glossary, and index. Rosen Common Core Readers can be paired with InfoMax Common Core Readers to provide another perspective to parallel topics. Readers take a journey through the major mountain ranges of the United States—from the Appalachian Mountains in the East to the Rockies in the West. CCSS English Language Arts Standards: RI.3.9., L.3.4a.