¿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.

La historia de los tres clubes más importantes de Chile contada por un padre a su hijo de la forma más entretenida: narración, humor, datos claves ¡y mucha pasión pelotera! Mi papá es un fanático de la Católica. Y cuando digo fanático es... ¡que le salen resortes por los ojos cuando ve los partidos! Durante una semana entera se dedicó a contarme la historia del club, y debo reconocer que me tuvo más embobado de lo que me pongo cuando juego Play. Me habló de un arquero emblemático al que le decían Sapo, vimos juntos en YouTube los mejores goles y me presentó a los entrenadores...

¿Una época, un periodo, sólo un momento? Ramírez analiza el arte que en estos años y bajo esta advocación se ha producido y/o difundido- la apoteosis Duchamp, las máquinas de Tinguely, los graffiti, el cine y la ciudad, la arquitectura postmoderna...-, sus problemas.

Is conversational Spanish turning a little too tricky for you? Do you have no idea on how to order a meal or book a room at a hotel? If your answer to any of the previous questions was ‘Yes’, then this book is for you! If there’s even been something tougher than learning the grammar rules of a new language, it’s finding the way to speak with other people in that tongue. Any student knows this – we can try our best at practicing, but you always want to avoid making embarrassing mistakes or not getting your message through correctly. ‘How do I get out of this situation?’ many...

Discusses the role of the gases surrounding Earth and the relationship of the atmosphere to weather. Presented in English and Spanish.