Agujeros negros (Black Holes)

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

Internet security breaches have been in the news of late. Organizations, governments, businesses, and individual internet users are all at risk. This book introduces readers to the importance of cybersecurity and addresses the current risks from hackers, viruses and other malware, identity thieves, and other online perils. It provides concrete measures that young digital natives can take to protect themselves and their computers, smartphones, and other devices. This volume's lively, cautionary narrative and useful tips will help readers effectively defend their identities and data.

Provides a basic introduction to caves, including geographical information and plant and animal life.

In this Spanish-translated script, travel back in time to when the Declaration of Independence was written. Students will act out the roles of the writers, experiencing the thoughts and feelings they had while creating this revolutionary document. This script includes roles written at various reading levels, allowing teachers to implement differentiation and English language learner strategies into their instruction. This feature allows teachers to assign each role based on their students' individual reading levels, encouraging everyone to get involved in the same activity. Whether students...

Una Biblia con el texto de la Reina Valera 1960 a la par de la versión inglesa New King James. Contiene además 128 páginas con lecturas que ayudarán al joven a acercarse a Cristo con valiosos consejos y recomendaciones sobre la vida cristiana y la relación con su Creador.