Exploremos las rocas sedimentarias (Exploring Sedimentary Rocks)

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.

When winter hits, many people in colder climates spend most of their time indoors. But what do wild animals do? Some animals spend winters hibernating. Beginning readers will learn what hibernation is, why some animals hibernate and others don't, and how hibernating animals prepare for their long sleep. Full-color photographs grab readers' attention and allow them to draw connections to the narrative. Readers will love learning about this mysterious, restful time in some animals' lives.

¡Ñee! ¡Hola, gente! ¡Soy Pacheco Cara Floja! Y en este nuevo libro quiero contaros cómo salvé la Tierra de una gran amenaza intergaláctica... Todo empezó cuando maté a aquel mosquito molesto de un golpe de remo. Bueno, el caso es que no era un mosquito, era un ser de otro planeta... ¡Qué demonios! ¿Cómo iba yo a saber que por haber acabado con ese bicho fastidioso una panda de alienígenas se iban a enfadar tanto? La única forma de salvar al planeta Tierra de la destrucción es viajar a Proteus y donar una muestra de mi ADN. Pero... ¿qué es lo que oculta Kran, el temible...

Introduces students to the alphabet and letter sounds and helps improve their Spanish-language skills.

So you think you're a martial arts master, but do you know the difference between kung fu, kendo, and karate? Students will learn about various martial arts as they practice comparing numbers. This Spanish math book combines math and literacy skills, and uses real-life examples of problem solving to teach subject area content. The full-color images, intriguing sidebars, practice problems, and math diagrams make learning math relevant and fun. Text features include a table of contents, glossary, and index to increase understanding of math and reading concepts. An in-depth problem-solving...

Este tomo de "Animales Salvajes" lo hemos dedicado a un grupo de aves que se distinguen de las demás por tener las patas y el pico muy largos. Son las aves zancudas, de las demás por tener las patas y el pico muy largos. Son las aves zancudas, de las que vas a conocer las especies más importantes (garzas, cigüeñas, pelícanos, espátulas, ibis, etc.), sus hábitats y sus costumbres. ¿Sabías que el ibis fue un animal sagrado del Antiguo Egipto?