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A scientific look at the natural processes that create waterfalls, and where they are likely to form.

In 1789, George Washington became the first president of the United States. With over 100 black-and- white illustrations, the fascinating story of "the father of our country" comes to life in Spanish - revealing the real man, not just the face on the dollar bill!

Dos niños viven una aventura en el monte, acompañados de un joven investigador. Las relaciones entre estos personajes, junto a los abuelos de los niños, sirven de pretexto a la autora para desarrollar el tema fundamental de la obra: la protección de la naturaleza.

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...