¿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.

Readers will learn about the important relationship between producers and consumers as well as buyers and sellers and how they all work together to create a healthy economy. This instructive volume defines basic economic concepts like goods and services and explains production with examples of the different types of production. It also covers the primary and secondary industries that produce goods. Concepts such as marketing and advertising are also covered, for a well-rounded view of this fascinating aspect of the economy.

Esta divertida y originalísima novela sobre una saga familiar escandinava constituyó el acontecimiento editorial del año 2005 en Dinamarca, donde además de obtener un notable éxito de público —más de cien mil ejemplares vendidos— fue galardonada con los premios más importantes, entre ellos Autor del Año, Libro del Año y el Golden Laurel, concedido por los libreros de aquel país. Después de pasar unos años en Ámsterdam intentando abrirse camino como pintor, Asger regresa a Dinamarca para despedirse de su abuela Bjørk, que está a punto de morir. De esta manera, el joven se...

Han pasado casi 30 años desde que se publicó esta novela que impulsó el renacimiento del fenómeno de publicaciones de Star Wars. Incluye una introducción del galardonado autor Timothy Zahn y una novela corta completamente nueva protagonizada por el popular Gran Almirante Thrawn. Como uno de los eventos más importantes en la historia de los libros de Star Wars, Heredero del Imperio sigue las aventuras de Luke Skywalker, Han Solo y la Princesa Leia después de haber llevado a la Alianza Rebeldehacia la victoria en Star Wars: Episodio VI. El regreso del Jedi. Cinco años después de que la ...

Manifest Destiny the name given in the 1840s to a belief that the coast-to-coast expansion of the United States was both inevitable and justified, regardless of the means. Standing in the way were not only the native populations, but also the descendants of Spanish settlers who had lived in the Southwest for centuries. The racist belief that white men rightfully should expand their institutions into the area brought the United States into conflict with Mexico. War was declared in 1846, and by the time the Treaty of Guadalupe Hidalgo was signed in 1848, ending the war, the US had gained...