Amazon.com description: Product Description: 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. This title teaches readers the difference between freshwater and salt water, using standards RI.2.5. and L.2.5a. to explore the essential concept of ecosystems.