Includes bibliographical references and index.

"What happened to the dinosaurs that once roamed Earth? Could they have been extinguished by an explosion or perhaps by a meteor? Through colorful images and accessible language, readers will explore the drastic events that forever changed life on Earth nearly seventy million years ago, learn more about the debris that's been falling to Earth for billions of years, and be introduced to the way Earth interacts with other objects in the solar system. Informative sidebars and fascinating facts encourage learners to ponder what lurks in space--and what it means for the future."--,Provided by publisher.

Grades 5 to 8.