¿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.

The early nineteenth century in the United States was a study of contrasts. On the one hand, the Jazz Age brought cultural liberation, vivacity, and reckless consumption; on the other, the Great Depression brought poverty and desperation to millions. Explore these periods in American history through the eyes of the people who lived them.

Hay ciertas palabras que son, ay, un dolor de cabeza. ¿Has o haz? ¿Tubo o tuvo? ¿Vallas o vayas? ¿Ves o vez? La maestra Evita E. Rores te da el remedio para que siempre, lo que se dice siempre, sepas cómo se escriben las cosas. -----------------------------------------------------------------------------------------------------There are certain words that, ouch, can be a real headache. Miss Evita E. Rores (aka Miss Write) gives you the everlasting cure so that you will always and forever remember how words are spelled.

El asesinato de Federico García Lorca (1898-1936) fijó la imagen de "La casa de Bernarda Alba" como la obra máxima de toda una dramaturgia. Con este drama en el que unos personajes y un espacio se encadenan con suprema maestría a una pasión estéril ?el amor no conseguido- cuya liberación sacrificial es la muerte, el poeta granadino llegó, en efecto, a una cumbre similar a la alcanzada por las más grandes creaciones del teatro clásico y contemporáneo. Mario Hernández fija rigurosamente en la presente edición el texto de esta tragedia en la que la tiranía de unas normas sociales...

Carlos goes into the cloud forest to look for animals, but he manages to miss seeing them even though they have an adventure with his umbrella.