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.

En este libro, Dolores Guerra canta lo que une al ser con los demás, sin negar aquello que lo separa y lo hace único e irrepetible. Versos desordenados rigurosamente encierra, como toda poesía, un diálogo perpetuo entre el yo profundo y la circunstancia vital en la que la autora se desenvuelve. Aprendamos de este diálogo que se puede crear un mundo donde la palabra tenga su fuerza para comunicar el amor y otras cosas sutiles que llenan la existencia del ser en cada instante.

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.

An innovative tool supports high school students and teachers in the area of language and communication. PP.

Reveals the truth about cannibalism in pre-Columbian America, avoiding sensationalism and opting for historical accuracy on a matter that has been subjected to all sorts of misinterpretations as well as mistaken beliefs.