El ferrocarril transcontinental (The Transcontinental Railroad)

People today refer to the Midwestern and prairie states as flyover country. During the Civil War, crossing those areas was the biggest obstacle in uniting the East and West Coasts of our divided nation. An act of Congress in 1862 authorized the Central Pacific and the Union Pacific railroad companies to build a railroad that would link the coasts. Seven years later, on May 10, 1869, an overwhelmingly immigrant labor force completed the task when a rail line was join in Promontory, Utah. The states had become united at last.

Presents aerial photographs of various scenes from around the world including fishermen in Morocco, a farm on the island of Crete, and a mangrove forest in New Caledonia.

Rosa always gets blamed when someone misbehaves. But she's very observant and knows how to find the real culprits. Will you be able to discover who it was? Play case by case and find the culprit by carefully observing the scene. Can't figure it out? Just pull the flap and find the solution!

Soy comerciante, soy marinero,yo soy el príncipe de este bazar.Guardo tesoros del mundo entero.¿Quieres mirarlos? Puedes pasar.Vendo este libro con los poemasque en mil viajes yo recogí:vienen del Sáhara, también de América...¿Quieres leerlos? ¡Son para ti!

Bridges are a big part of how people get from place to place. But how do they work and how are they built? In this engaging text, readers will explore these important engineering marvels that link places divided by water. Along the way they’ll learn how to build their own model bridge with a step-by-step guide accompanied by full-color photographs of each step. Accessible text illuminates the science behind every span we drive over—and sometimes under!