Readers will delight in the high-interest educational topics addressed in this book, which is aligned to the 2nd 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 the InfoMax Common Core Readers to provide another perspective to parallel topics. Readers will follow Rocky as he organizes his rock collection, gaining an understanding of rock characteristics and classification. This book satisfies CCSS English Language Arts Standards: RI.2.4. and L.2.2c.