¿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.

Este libro presenta el concepto y el vocabulario básico de las virtudes, y ayuda a los niños a reconocer y a clasificar los diferentes buenos comportamientos que aún tienen que desarrollar.

Tercera aventura de Maya Erikson Nada más ver el extraño avión que los llevaría a su destino, Maya entendió que aquel no iba a ser un viaje normal; «la Antártida es un lugar hostil», les dijeron. Al principio, todo parecía tranquilo, hasta que en una inocente excursión con sus compañeros presencian un misterioso suceso. Cuando el equipo de investigación llega, su extraña actitud los hace desconfiar... ¿Qué está pasando realmente? Mientras intentan averiguarlo, acaban descubriendo algo que nadie se imaginaba. Entonces empieza su lucha por salvar el continente. **** Maya Erikson ...

In the third book in Andrea Camilleri's Montalbano series, the urbane and perceptive detective exposes a nest of corruption and international intrigue in a compelling new case. When an elderly man is stabbed to death in an elevator and a crewman on an Italian fishing boat is shot by a Tunisian patrol boat, only Montalbano suspects the link between the two incidents.

Dexter is displeased. Like any self-respecting, totally decent, soundly homicidal guy, Dexter Morgan takes great pride in his work and is careful to remain anonymous. As his colleagues grow more paranoid of the killer in their midst, Dexters position is increasingly perilous. He is running out of time to track down this copycat.