From the Blastoff! Readers series, this book is from Learning About the Earth series and focuses on coral reefs. The book explains what coral reefs are, how they are built, the types of reefs and about them being alive. The book also has a glossary, learn more and index at the end. This book has bright, vibrant pictures. I really like these Blastoff! Readers books. I always feel they have high quality photos, nice thick pages and are written well. This is another good one.