El ciclo del nitrógeno (The Nitrogen Cycle)

Despite unprecedented economic growth, the injustices and turmoil endured by Mexico over the course of Porfirio Diaz's three-decade presidency would lead to the outbreak of that country's biggest social revolution. In this profusely-illustrated history book for children, the events surrounded Porfirio Diaz's mandate are narrated in a simple, clear style. The book's profuse illustrations contribute to a didactic and comprehensive understanding of the Porfiriato. The supplementary charts and the timeline spanning the 1876-1911 period help organize and narrow down the most relevant facts in this ...

El libro ofrece un material para aprender español de forma novedosa, utilizando los planteamientos recogidos en el Marco común de referencia y en los Niveles de referencia para el español, que permiten ayudar al alumno a conocer, comprender y utilizar el español de forma práctica. Está constituido por seis módulos. Cada módulo está formado por los cuatro ámbitos de uso de la lengua (Ámbito personal, Ámbito público, Ámbito profesional y Ámbito académico) para poder utilizar la lengua de una manera más adecuada a cada situación. Propone un aprendizaje activo, dinámico y...

Here's another exciting set of sports-themed titles for third- through sixth-grade readers reading at a first-grade level. Help to even out the playing field for your at-risk readers with these sports heroes and hot shots.

Alexander Graham Bell was always trying to invent new things! In this biography that has been translated into Spanish, readers will learn about Alexander's life as a teacher and inventor of such incredible inventions as the telephone, record player, and metal detector. Colorful images, supportive text, an interesting timeline, and a helpful glossary, table of contents, and index combine to give readers an inspiring look into the life of Alexander Bell.