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...

Packed with lively illustrations and fascinating flaps, this book is bursting to reveal amazing secrets."

Lakshmi se ha separado de su familia y camina hacia la ciudad. Aún desconoce que allí no trabajará de criada en una casa rica para enviar dinero a su familia. Aún desconoce que tendrá que hacer cosas horribles con hombres horribles para poder sobrevivir. Lakshmi imagina leche y azúcar para su familia. Aún desconoce que las cosas no son siempre como se imaginan.

The Pledge of Allegiance was written in 1892 by a man named Francis Bellamy for a children's magazine called The Youth's Companion. Mr. Bellamy wanted the flag to fly above every school in America so that children would feel pride and love for their country when reciting the words to the Pledge of Allegiance. Each stunning photograph of laughing children, sweeping landscapes, or furling flags, is surrounded by bold, colorful borders, making this book a visual celebration of the words of America. Aprende a decir en espanol y en ingles la promesa a la bandera que recitas todos los dias en la...

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther. This 6-Pack includes six...