Conservación de la masa (Conservation of Mass)

Light can travel faster than anything else in the universe. But what exactly is light, and where does it come from? This nonfiction Spanish book teaches students all about light, and introduces them to important scientific concepts and vocabulary terms like infrared, ultraviolet, photos, and visible spectrum. The intriguing images, detailed diagrams, and stimulating sidebars will keep students connected to the text. The fun lab activity provides a real-world learning experience that supports STEM instruction. Aligned to state and national standards, the leveled text supports differentiation....

La polémica en torno a la reforma de la Administración local plantea una reflexión crítica sobre la constitucionalidad de los nuevos límites de la autonomía local y el actual control sobre los municipios. Su planteamiento, no obstante, en términos de calidad democrática diseña un modelo de Gobernanza local propulsor de derechos de la ciudadanía y nuevos principios de transparencia, buen gobierno, participación y gobierno abierto, con la introducción de deberes y responsabilidades inéditas en la esfera municipal. Sin embargo, este estudio aborda el reverso de las nuevas tendencias ...

The overall concept of money usually comes easily to young learners who curiously watch the exchange of money for goods from an early age. However, noticing the distinguishing characteristics of different kinds of money, such as coins and paper notes, is a bit trickier. This helpful and engaging book is an excellent companion for those who are learning to discern the different types of money. It also touches on the valuable skills of sorting and classifying, which are important concepts in early elementary math curricula.

La Ciencia nueva es una obra clave de la tradición cultural de Occidente. Su concepción es de tal riqueza que se ha considerado a su autor, Giambattista Vico (1688-1744), precursor de los románticos, de Hegel y de Marx; da origen a la Estética moderna, y crea el ámbito necesario para el surgimiento de las ciencias humanas, cimentando los fundamentos de la lingüística y de la antropología actuales. A través del novedoso empeño de una filosofía de la historia, su amplia y compleja visión del mundo ha seguido fascinando a pensadores y creadores contemporáneos tan dispersos como...

In the middle of the 1830s, Texans fought against the Mexican government for its independence. During the Texas Revolution, many leaders emerged, such as Sam Houston, Lorenzo de Zavala, William Travis, Francita Alavez, Sidney Sherman, Susanna Dickinson, James Bowie, and Juan Seguín. This captivating biography has been translated into Spanish and allows readers to learn about the incredible accomplishments of these people and what they did to make an impact on the Texas Revolution. Featuring alluring images, engaging facts and sidebars, supportive text, and a glossary and index, this book...