¿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.

The rock cycle has been taking place for millions of years. However, geologists have only known about this phenomenon for about 300 years. Young terrestrial explorers are introduced to different types of rocks, where in the cycle these rocks fit, and where in Earth's layers each step takes place. Fact boxes provide readers with fun additional information. A diagram helps readers make sense of the new information they're learning.

Although Earth is mostly made up of igneous and metamorphic rock, sedimentary rock covers about 75 percent of Earth's land surface. This means it's the most visible kind of rock on Earth. Sedimentary rocks form when sediment accumulates and compacts. Your readers will learn how sedimentary rocks form, the different types of sedimentary rocks, and how people use sedimentary rocks. Fun fact boxes provide readers with additional information. A helpful diagram illustrates how sedimentary rocks form.

Kamo es un chico que acuerda con su madre aprender inglés en tres meses. Para lograrlo se carteará con Cathy,una chica inglesa francamente extraña, que parece vivir en otra época, a juzgar por el estilo de sus cartas y por el ambiente que describe. Sin poder evitarlo, Kamo iniciará una relación postal con ella que cambiará totalmente su modo de ver la vida. ¿Puede el amor viajar a través del tiempo? Un libro que pone de manifiesto la importancia de la amistad y los vínculos familiares.

An innovative tool supports high school students and teachers in the area of language and communication. PP.

Ilustrada a todo color, incluye 365 historias que van desde “La serpiente astuta” hasta “el arco iris”, desde “Desastre en Egipto” hasta “Jonas en el mar”, o “Jesús y los niños”. Cada historia es presentada en un lenguaje vibrante y fácilmente comprensible. También se incluye mapar y dibujos de los tiempos bíblicos. Illustrated in full color, this Bible includes 365 stories from “The Cunning Snake” to “Jesus and the Little Children”, and is retold in vibrant and easily understandable language. Also iIncluded ares maps and pictures of Bible times.

Alexander Graham Bell was always trying to invent new things! In this biography that has been translated into Spanish, readers will learn about Alexander's life as a teacher and inventor of such incredible inventions as the telephone, record player, and metal detector. Colorful images, supportive text, an interesting timeline, and a helpful glossary, table of contents, and index combine to give readers an inspiring look into the life of Alexander Bell.