¿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.

El objetivo de esta obra no es tanto la dogmática de la acción y de la comisión por omisión en sí mismas consideradas, sino básicamente el ajuste de ambas al principio de legalidad. Como ese ajuste es profundamente discutible, se ha creído necesaria una reflexión sobre los fundamentos y los fines de la dogmática penal. El resultado de esa reflexión es alarmante porque muestra un abuso del Derecho penal que no se limita a la comisión por omisión ni a la vulneración del principio de legalidad, sino que va mucho más allá. En efecto, hay muchas otras amenazas para la libertad que...

Ya sea polvorosa o mojada, suave o flexible, en todas partes hay materia. ÁHasta el aire est‡ formado de materia! Mira c—mo los s—lidos, los l’quidos y los gases cambian de forma en este libro sobre la materia.

A young boy eagerly awaits the birth of his brother or sister, while imagining that the baby is in a house inside his mother.

Entering a city oppressed by a High Epic despot is risky, but David's willing to gamble. Because killing Steelheart left a hole in David's heart. A hole where his thirst for vengeance once lived. Somehow, he filled that hole with another Epic--Firefight. And now he will go on a quest darker and even more dangerous than the fight against Steelheart to find her.