3Introduces readers to air, while explaining how the resource is used, problems facing the natural resource, and what the future of it looks like. Vivid photographs and easy-to-read text aid comprehension for young readers. Features include a table of contents, an infographic, a timeline, fun facts, Making Connections questions, a glossary, and an index. QR Codes in the book give readers access to book-specific resources to further their learning. Aligned to Common Core Standards and correlated to state standards. DiscoverRoo is an imprint of Pop , a division of ABDO.