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.

Únete a Tortuguito en su increible viaje desde la playa donde nació y a donde vuelve tiempo después, en un viaje increíble y peligroso. él tiene que ser valiente, tiene que ser audaz y todo debe hacerlo por su cuenta.

The values and traditions of Mexicans at home, school, and work are explored as well as how life differs in urban and rural settings.

Esta serie de cinco títulos, es una guía práctica y sencilla, que demuestra que pintar con acuarelas no es tan difícil como algunos creen, si se siguen las indicaciones dadas por el autor.

Young children are natural problem-solvers and always looking for answers, especially when it involves interesting animals. This Spanish-language edition of Scaly Swimmers provides young curious readers with striking visual clues and simply written hints. Using the photos and text, readers rely on visual literacy skills, reading, and reasoning as they solve the animal mystery. Clearly written facts give readers a deeper understanding of how the animal lives. Additional text features, including a glossary and an index, help students locate information and learn new words.