César Chávez

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...

Learn all about the amazing things your brain does and how to keep it healthy and strong! Readers will discover the anatomy of the brain including neurons, the cerebellum, and the nervous system. Using vibrant images and informational text in conjunction with supportive diagrams, this Spanish-translated nonfiction title encourages readers to learn all about (and use) their brains.

Si estás por rendir el examen de piloto privado de avión, esta obra te resultará de mucha ayuda. Con el correr de las páginas pondremos a prueba tus conocimientos para la obtención de la primera licencia aeronáutica, tu licencia de Piloto Privado de Avión. El formato de este libro se divide en dos secciones. La primera basada en un banco de preguntas relativas a los conocimientos teóricos mínimos que debería tener un estudiante para aprobar su examen. La segunda sección, un innovador sistema de simulación del examen práctico en vuelo con el evaluador (inspector de la autoridad...

Wind Power: A waving flag, blowing leaves, a kite soaring through the skyall are moved by wind power. Wind is also our fast-growing source of energy. Find out how wind forms and the different ways we may use it in the future.