10 cosas que puedes hacer para ahorrar electricidad

This book introduces you to hippopotamuses, including their size, diet and everyday behavior, which highlights differences between those in the wild and those living in a zoo habitat.

An introduction to the night sky, describing major constellations and the planets of the solar system.

NASA wants to send humans to Mars within the next 25 years, but before that can happen, they must plan and prepare. This Spanish Interactiv-eBook will engage students as they read about STEM topics, building both their literacy skills and math content knowledge. With a focus on NASA's Mission to Mars, students will learn problem solving through the use of real-world examples. Captivating images, practice problems, and mathematical charts and diagrams help develop students' problem solving skills. Text features such as a glossary, index, and a table of contents increase understanding and build ...

Este libro explora que es lo que sucede dentro y fuera de nuestro mundo, desde un volcán incadescente al Polo Norte helado.