Crisis energética: El futuro de los combustibles fósiles (Energy Crisis: The Future of Fossil Fuels)

From art and architecture to politics, philosophy, and mathematics, "western civilization" owes a great deal to the achievements of ancient Greece, but what do we really know about this long-gone civilization? How did geography influence the politics of the Greek city-states? What's the difference between an agora and an acropolis? This book takes readers several thousand years into the past, when independent city-states ruled the Mediterranean Sea, to find the answers. Full-color photographs and maps, accompanied by accessible text, introduce readers to the many contributions the ancient...

NASA wants to send humans to Mars within the next 25 years, but before that can happen, they must plan and prepare. This Spanish Interactiv-eBook will engage students as they read about STEM topics, building both their literacy skills and math content knowledge. With a focus on NASA's Mission to Mars, students will learn problem solving through the use of real-world examples. Captivating images, practice problems, and mathematical charts and diagrams help develop students' problem solving skills. Text features such as a glossary, index, and a table of contents increase understanding and build ...

Poems celebrating the life and work of Cesar Chavez and the Mexican American labor movement in the 20th century. This thoughtful and beautiful biography illuminates not only the events that made up the great labor leader's life, but also the ideals and inspiration that are his legacy.

Cecilia es la única persona que visita a Silvio, un hombre que guarda celosamente el misterio de una vida de leyenda que nunca ha querido compartir con nadie. A través de una caja con fotografías, Silvio va dando a conocer a Cecilia su fascinante historia junto a Zachary West, un extravagante norteamericano cuya llegada a Ribanova cambió el destino de quienes trataron con él.

La cocina es un lugar excelente para que los pequeños comiencen a descubrir el mundo natural mediante la observación y la experimentación de las frutas y las verduras que comemos todos los días: ¿qué clases de semillas existen? ¿Cuántas formas pueden tener las hojas? ¿Cómo crecen los gajos de las naranjas? En forma de un diario de campo, este libro de actividades invita a los jóvenes naturalistas a responder estas preguntas y pensar en muchas otras, y los anima a cortar, manipular, secar, cultivar, fotografiar, dibujar y coleccionar (y también comer) alimentos que ya tenemos a la...