Cómo funcionan los ecosistemas

It is the third Monday in January and school is closed. But do you know why? It's Martin Luther King Jr. Day. Turn the pages of this book to find out what dream Dr. King shared with the world, who Mohandas Gandhi was, how one brave woman helped Martin Luther King Jr. change history. Each book in the Holiday Histories series describes one of America's holidays or special days. Explore the history of each day and learn the real reason why it is important. Discover what special meaning each day might have for you.

Readers begin to explore the vastness of our universe in this engaging volume. They start with subjects such as comets, meteors, planets, and more. Vivid full-page photographs accompany accessible text in both English and standard Latin-American Spanish.

En la mansión del conde Vázquez acaba de nacer un fantasma negro. La familia se lleva un tremendo disgusto porque un fantasma negro no se ve, y si no se ve, no asusta, y si no asusta, no le sirve de nada ser fantasma. ¿O sí? Cuando el resto de fantasmas está en apuros, el fantasma negro es el único que puede ayudarlos. "El fantasma negro" es una historia que nos habla de la diferencia con respeto, amor y mucho humor.

A force is a push, a pull, or a turn. Every force has an equal and opposite force. Forces are always with you! They are all around us. Learn about forces with this Spanish science reader that features easy-to-read text. Nonfiction text features include a glossary, index, and detailed images to facilitate close reading and help students connect back to the text. Aligned to state and national standards, the book also includes a fun and engaging science experiment to develop critical thinking and help students practice what they have learned.