Through easy-to-follow text and full-color photos, the concepts of day and night are explained in ways that are easy for readers to understand using topics such as the diurnal and nocturnal activities of people and animals. A Words to Know section at the beginning of the book helps students learn new vocabulary they will encounter in the text, while suggestions for other titles and websites encourage students to learn more. Detailed Table of Contents, Full-Color Photographs, Further Information Section, Glossary, Index, Sidebars.