For millions of years these fantastic creatures roamed our planet. Then, suddenly, they all disappeared. Scientists investigate what could have caused this huge extinction 65 million years ago. Distinguished writer Franklyn M. Branley and award-winning artist Marc Simont provide the perfect introduction to an always fascinating subject—the disappearance of the dinosaurs. This Outstanding Science Trade Books for Children is a clear and appealing science book for early elementary age kids, both at home and in the classroom. It's a Level 2 Let's-Read-and-Find-Out, which means the book explores more challenging concepts for children in the primary grades. The 100+ titles in this leading nonfiction series are: Books in this series support the Common Core Learning Standards, Next Generation Science Standards, and the Science, Technology, Engineering, and Math (STEM) standards. Let's-Read-and-Find-Out is the winner of the American Association for the Advancement of Science/Subaru Science Books & Films Prize for Outstanding Science Series.