¿Por qué hibernan los animales? (Why Animals Hibernate)

Although Earth is mostly made up of igneous and metamorphic rock, sedimentary rock covers about 75 percent of Earth's land surface. This means it's the most visible kind of rock on Earth. Sedimentary rocks form when sediment accumulates and compacts. Your readers will learn how sedimentary rocks form, the different types of sedimentary rocks, and how people use sedimentary rocks. Fun fact boxes provide readers with additional information. A helpful diagram illustrates how sedimentary rocks form.

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.

What do you do if you find yourself stranded at sea? This useful Spanish-translated nonfiction book gives readers the information they need in order to survive at sea. With essential tips and instructions, helpful diagrams and images, a bibliography, and a list of other useful websites, readers will learn everything they need in order to survive--from the dangers of hypothermia, what to do if there's only saltwater available, and other useful survival skills.

Filled with geographical and historical data, this unique book explains the beauty and characteristics of the Chihuahua desert, the largest desert in Mexico.

En este cuaderno aprenderás la ortografía de numerosas palabras que se escriben con v y h, y te ejercitarás en la ortografía de diversas sílabas trabadas y libres. También se estudian algunas reglas fundamentales del uso de las mayúsculas: en principio de escrito y después de punto.

El mundo de los libros es un mundo casi de otro mundo. Un mundo propio, mundo único, un mundo sostenido por el tenue hilo de una inspiración y un sujeto inspirado. Pero “el libro” posee en su interior big bangs semánticos que no paran de generar universos por doquier. Universos donde viajar, donde aprender, donde disfrutar y donde perderse. En esta breve obra hablaremos en primer lugar del libro. Qué es, cómo se concibe y, sobre todo, como es percibido por doctos e indoctos. Luego pasaremos a examinar de cerca a aquellos que aman tanto los libros que sufren una enfermedad de afecto...