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

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.

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.

Una enciclopedia visual esencial para conocer el impresionante mundo de los minerales, las gemas, las rocas y los fósiles de nuestro planeta Más de 1.000 impresionantes fotografías muestran con gran detalle las maravillas naturales de la Tierra. Las propiedades únicas de los minerales se describen detalladamente, junto con sus usos en el arte, la industria, la arquitectura y la ciencia. Un viaje geológico extraordinario para descubrir las rocas arcoíris, los minerales fluorescentes, los diamantes de valor incalculable y las lluvias de meteoritos. Conoce a los dinosaurios para comprender ...

Spanish Language Edition. This Spanish version of the Picture Bible is as classic as the English version. A great Bible for young readers and is loved by people of all ages.

If a person were ever face-to-face with a huge, hungry animal with sharp teeth, they probably wouldn’t care exactly what that animal was! But from a safe location, can we tell whether it was a crocodile or alligator that wanted to take a bite? By examining their jaw structure, teeth, and other physical features, we can easily tell these two animals apart! Graphic organizers and amazing images highlight each animal’s habitat and other small differences between the two fearsome creatures, showing readers just what creature is lurking below the waters.

A foundered Victorian ship looking for the fabled Northwest Passage holds a secret in its icy grave... When Dirk Pitt of NUMAr is almost blown to pieces in a lab explosion, he suspects sabotage. The lab in question belongs to a scientist hoping to use a rare mineral to combat greenhouse gases - but who would want to destroy our one chance to save the planet? However, there are those who will do anything to control such a valuable prize. Pitt's investigations take him to the Arctic in search of a clue to the origins of this precious mineral. There he and NUMAr colleague Al Giordino must battle ...