Dentro del laberinto

The sun is responsible for all life on Earth, but what exactly is it? Our star is an amazing force that can be as dangerous as it is important. From solar flares to the threat of blowing up altogether, the sun is one of the most interesting things in our solar system. Readers take a trip to the sun to see how it works and exactly what it is made of. Theyll learn about the life cycle of a star and see just how long we have until we have to find a new planet to call home. Dont worry, theyll be happy to learn that (hopefully) we have millions of years left!

An elementary introduction to the workings of the human body, the skeleton, skin, circulation, and nervous system.

The United States grew rapidly from the time of the Louisiana Purchase to the building of the Transcontinental Railroad. All of this expansion came at the expense of Native American populations that had either lived in the region for centuries or been forced there from ancestral homes in the East. Tribes memorably fought on their own and together in an doomed effort to retain the land and a lifestyle that had long sustained their families. This book outlines some of the major conflicts of the Westward Expansion, and of the treaties and were signed, and often broken, by representatives of the...

Los criterios informadores que han atendido los autores de esta obra son: servir de soporte didactico y pedagogico basico, enfocar las unidades didacticas desde una perspectiva teorico-practica de aprendizaje del tecnico y complementar los contenidos conceptuales de cada una de las unidades didacticas con actividades teorico-practicas que faciliten el aprendizaje de las mismas.