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

Diamonds and salt are both minerals, but diamonds are more rare than salt. Curious readers will learn what physical and chemical conditions must be present for minerals to form. They'll discover how minerals are identified and how they are used in daily life. Informative and interesting text presents readers with this science content in a fun way. A graphic organizer shows how different minerals are identified and fact boxes provide readers with exciting supplementary information.

When rocks change because of environmental conditions, the new rocks are called metamorphic rocks. A rock's chemical or physical makeup may change because of conditions such as temperature, stress, or pressure. Your readers will learn fascinating facts including where metamorphic rocks are most commonly found, the different types of metamorphism, and how metamorphic rocks are identified. Full-color photographs depict these rocks in nature. A helpful graphic organizer shows how these fascinating rocks form.

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.

Este libro, Jugar a pensar con cuentos, narra las aventuras de la simpática mariquita Juanita que viajando por el mundo trae distintos cuentos, como recuerdos, en su mochila. Y como ese personaje sigue inquieto, su historia si llena de cuestionamientos sobre todo lo que los cuentos le hacen pensar. Este libro es un viaje reflexivo que invita a los niños a pensar mientras se divierten con Juanita y sus interrogantes.

Universo is one book in the Spanish-language Gran Atlas de la Ciencia series that covers today's most popular science topics, from digital TV to microchips to touchscreens and beyond. Perennial subjects in earth science, life science, and physical science are all explored in detail. Amazing graphics--more than 1,000 per title--combined with concise summaries help students understand complex subjects. Correlated to the science curriculum in grades 5-9, each title also contains a glossary with full definitions for vocabulary.

El anciano conde Olivier de Salvadrés ha vivido casi toda su vida fingiendo ser mujer. Arrepentido, hace confesión escrita de su pasado y de las circunstancias que lo abocaron a esa impostura, como penitencia ordenada por el abad Bonafides. La condena eclesiástica se cumplirá sobre el manuscrito, que será quemado públicamente en lugar del conde cuando éste ya haya muerto. Sabiendo que no se expone a la hoguera ni a la vergüenza, y sin hijos ni familiares que hayan de soportarla tampoco, el antiguo travestido no nos ocultará ningún detalle de su agitada existencia ni de sus...