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

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.

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.

La madre de Claudia, la niña protagonista de esta historia, es muy peculiar: es tan pequeña que cabe en un dedal. Hay ventajas y desventajas para los tres miembros de la familia. ¿Qué divertidas situaciones se vivirán en este insólito hogar? Una estupenda historia que retrata con mucho humor las relaciones familiares.

This complete Spanish translation of the highly acclaimed Isaac Asimov's 21st Century Library of the Universe is ideal for students still developing their English-language skills.

Testigo inigualable de su tiempo, Francisco de Goya fue un pintor y grabador versátil que lo mismo retrató a la corte, sus fiestas y juegos, que los horrores de la guerra. Ácido e incisivo cuando se asumía como crítico, fue también delicioso y grácil al celebrar la belleza y el placer cortesanos. Un acercamiento a un hombre que, a pesar de su sordera, supo escuchar mejor que nadie las contradicciones de El siglo de las luces. An unequaled witness of his time, Francisco de Goya was a versatile painter and engraver who portrayed both the court, with its parties and games, and the horrors ...

"While preparing for Christmas in Puerto Rico, seven-year-old Esmeralda asks the Three Magi for a baby doll like her cousin's, but when they bring something else instead she gains a deeper understanding of the meaning of the holiday."