This book covers everything about mountains, from how they're formed, to their climate, to where they're found, to the people who have settled them. A glossary and index address key subject matter and terms, while discussion questions aid in reading comprehension. Grade: 4 Subject: Geography Genre: Informational Text Comprehension Skill/Strategy: Identify Main Ideas/Details Diagnostic Reading Assessment (DRA): 40 Guided Reading Level: S Lexile Level: 810L DK's iOpeners equip K-6 students with the skills and strategies they need to access and comprehend nonfiction so that they are not only learning to read but reading to learn. The combination of high-interest content and eye-popping photography of iOpeners brings science and social studies topics to life, raises student achievement in reading, and boosts standardized test scores.