¿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.

La historia de Robinson Crusoe se ha contado muchas veces pero nunca desde el punto de vista de los animales que viven en la isla. Los animales se van cediendo la palabra, desde Yaguatirica, el gato montés, que es quien encuentra a Robinson, a la tortuga que le enseña a comer sabrosos gusanos. Según los animales, Robinson, a quien ellos llaman “Tinga” por su color blanco, era un inútil que no hubiera sobrevivido sin su ayuda. Todo cambia el día en que llega Taiguara, es decir “Libre”, al que Robinson se empeña en llamar Viernes.

If asked to define a forest, readers might say, "It has a lot of trees." But many places have a lot of trees. So, what makes a forest a forest? Readers discover that a forest is unlike any other biome on Earth. And a temperate forest is even more specific. Readers learn the many life cycles found within a forest and how the energy pyramid explains the numbers of forest plants and animals. In addition, readers learn by examining how forces usually considered destructive work to help forests survive. 32pp.

Explores our natural connection to the earth and its four elements, air, water, soil, and fire, underlining the importance of biodiversity and respect for the environment.

Alex Rodriguez es uno de los beisbolistas mas electrizantes que han llegado al diamante en los ultimos anos. Reclutado directamente de la escuela secundaria, ha padecido pocos de los problemas de adaptacion que tipicamente asedian a los jugadores jovenes. Por el contrario, ha mostrado al mundo lo que significa ser una superestrella, no solo en el campo de juego, sino en la vida. Su destacado juego con los Mariners de Seattle contribuyo a que ese equipo jugara, ano tras ano, los partidos de las series finales de la postemporada. Pero A-Rod nunca ha permitido que el exito y la fama se le suba a ...