John Muir

The Uses Of Wind Energy Is The Topic Of This Book. Explains The Positive And Negative Impact This Form Of Energy Can Have On Our World.

Follows The Thirteenth Amendment That Freed The Slaves, The End Of The War, And The Death Of President Abraham Lincoln.

Provides The History Of Biofuels, Different Uses, Positive And Negative Characteristics, And How They Will Impact The Future.

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

Many animals live in water, but only some can be defined as fish. Twenty-eight thousand species of fish exist, each with different characteristics. Readers from grades one through four will learn that fish have a distinct impact on their ecosystem and will see how fish survive when well-adapted to an uncompromised environment. Beautiful photographs demonstrate the great diversity of fish and accompany intellectually stimulating explanations of their varying roles and traits. From page to page, what a fish is unfolds in vocabulary call-outs, insightful questions, and relatable...

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...

Las acciones que implican el cierre de escuelas rurales con baja matrícula para forzar los alumnos a movilizarse a centros educativos de mayor tamaño no son nuevas. Iniciaron en Estados Unidos desde finales del siglo XIX y desde entonces se han aplicado con diversos grados de intensidad en muchas naciones a través de varias modalidades. Aunque estas acciones se han sostenido con el argumento de que las pequeñas escuelas son de baja calidad, en el fondo estas medidas se apoyan en criterios meramente económicos: es más barato para el Estado sostener escuelas de mayor tamaño que varios...

Six titles in the illuminating Who Was . . . ? series are now available in Spanish-language editions. Each title features black-and-white illustrations.