Exploremos los minerales de la Tierra (Exploring Earth's Minerals)

When winter hits, many people in colder climates spend most of their time indoors. But what do wild animals do? Some animals spend winters hibernating. Beginning readers will learn what hibernation is, why some animals hibernate and others don't, and how hibernating animals prepare for their long sleep. Full-color photographs grab readers' attention and allow them to draw connections to the narrative. Readers will love learning about this mysterious, restful time in some animals' lives.

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.

Consolidates the Student's Book lessons with targeted practice, unit by unit Additional practice of reading, writing, speaking, listening and use of English skills Extensive grammar and vocabulary practice Complete practice exam in Unit 10 Designed for independent study at home and practice in class Audio for listening lessons available on the Student's App

El derecho a la pereza es la obra más célebre de Lafargue, y es el texto más difundido de la literatura socialista a nivel mundial, después de Manifiesto del Partido Comunista, de Karl Marx y Friedrich Engels. Una obra controvertida y revolucionaria tanto para la derecha como para la izquierda. En su libro Paul Lafargue plasma claramente sus reflexiones contra el fervor por el trabajo, la productividad, y el crecimiento económico fanático que mostraban tanto la derecha como la izquierda. Lafargue observo que cuanto más trabajaba un obrero más miserable se volvía su vida, y aun así...

Su obra, desbordante de contenido humano y de una frescura rítmica inimitable, sitúa a este autor cubano entre los más grandes poetas en lengua española.

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.