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.

A tale of the scary fantasies that arise in the darkness, the fear of cruel and wicked beings, and the desire to be protected.

Saturno Airlines es la nueva aerolínea de Cristian Cipriani y la única que te ofrece viajar a destinos tan exclusivos como tu alma, tus deseos ocultos y tus sueños más descabellados. Saturno te permite viajar solo o con un acompañante especialmente elegido para cada trayecto, el equipaje debe ser ligero, sólo lo que puedas cargar contigo pues no queremos que tu viaje se vea estropeado por pesos innecesarios y lastres inútiles. Saturno Airlines te brinda una atención personalizada que te permitirá realizar cada trayecto con confianza y tranquilidad. ¡No esperes más, ven a hacer el...

Newton's laws aren't the easiest science topics to digest. Struggling readers likely find understanding them even harder. This volume breaks down the topics of force and motion to its most basic and understandable parts, perfect to introduce to readers having a hard time or students looking to review for class. Written in succinct language, each chapter contains fact boxes and graphic organizers to aid all readers as they move from speed, to velocity and on.

Learn About What Makes A Nation, Including Political Boundaries, Government Systems, Money, And Shared Traditions. Social Studies Based Leveled Readers For Use In Guided Reading And Social Studies Instruction.