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.

Readers will learn all about the United States' westward expansion in this interesting nonfiction Spanish-translated book, which uses appealing images, helpful maps, and supportive text to keep children engaged from beginning to end!

Aquest volum aporta els aspectes clau del desenvolupament de les ciències, però també les preguntes més substantives vinculades a la seua evolució, sense incórrer en la tecnolatria. Aquest text, avaluat ja en diferents aules de batxillerat, aporta aspectes claus del desenvolupament de les ciències, així com les preguntes més substantives vinculades al seu desenvolupament. La proposta cerca la senzillesa i pretén que l'alumnat s?habitue a un format de llibre diferent a l'habitual, doncs serà el reflex dels quals utilitzarà en el futur.

The rock cycle has been taking place for millions of years. However, geologists have only known about this phenomenon for about 300 years. Young terrestrial explorers are introduced to different types of rocks, where in the cycle these rocks fit, and where in Earth's layers each step takes place. Fact boxes provide readers with fun additional information. A diagram helps readers make sense of the new information they're learning.

Did you know that baby butterflies look like worms with legs? Caterpillars turn into butterflies inside a shell. Discover more about these flying insects in Butterflies, part of the Life Cycles series of EYEDISCOVER books.