Energía del viento

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

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

Solar Energy Is Explained. Included In This Book Is Where It Comes From, Who Uses It, And The Positive And Negative Benefits Of Using It. Correlated To Common Core, Texas TEKS, Virginia Sols, And Georgia Performance Standards.

This inspiring biographical series ties in with elementary history, science, and social studies curricula, providing teachers with a valuable interdisciplinary resource. With these books, young readers will discover historical figures who devoted their lives to making the world a better place, and changed the course of history. Text copyright 2004 Lectorum Publications, Inc.

Con la liberación de cuatro millones de personas esclavizadas después de la Guerra Civil, el período de la Reconstrucción trajo nuevas victorias y dificultades en la lucha por los derechos de las personas negras. Aprende más sobre este período crucial de la historia de EE. UU. With the liberation of four million enslaved people after the Civil War, the Reconstruction period brought victories and challenges in the fight for Black rights. Explore this crucial period in US history. Now in Spanish! Read Woke(TM) Books are created in partnership with Cicely Lewis, the Read Woke librarian....

An asteroid hitting Earth may sound like science fiction, but it is a real danger. This book explores what the different scenarios might be and how we can prepare ourselves in case such a disaster should occur.

Un rey y unos inesperados compañeros de viaje emprenden una travesía que los llevará más allá de toda tierra conocida. A medida que navegan por mares que no aparecen en los mapas, descubren que su misión es más arriesgada de lo que habían imaginado y que el fin del mundo es, en realidad, el umbral de una tierra incógnita.

Rodeo Barrel Racing Is Described In This Book. Readers Learn About Necessary Equipment And Techniques, Famous Riders, Animals, Records, Venues, And Championships.