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

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 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.

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.

Por qué hay día y noche? Porque la Tierra gira sobre sí misma en 24 horas y porque el Sol no puede iluminar más que un lado a la vez.El cielo, las estrellas y la noche ilustrado por Christian Broutin, Henri Galeron y Pierre-Marie Valat, es un libro de la colección Altea Benjamín, la enciclopedia para responder a las preguntas de los niños que ya leen solos. ENGLISH DESCRIPTION Why is there day and night? Why does the Earth rotate on its axis and comes full circle in 24 hours? Why does the Sun only illuminate one side of the Earth at a time? Fascinating information about space and...

In AD 79, the residents of the booming Roman city of Pompeii were shocked when a nearby mountain exploded, releasing superhot ash, rock, and gas on the surrounding areas. What happens next is the extraordinary account of a volcano in action. Though the people who didn't flee Pompeii were doomed, the volcano preserved their remains, allowing us to better understand a fascinating time in the Roman Empire. Astonishing photographs of Pompeii, primary source records of the occurrence, and riveting text are just some highlights of this high-interest volume.

La Ciudad de Massi ha sido arrasada, un auténtico caos se ha desatado en sus calles. Edificios en llamas, aldeanos corriendo como locos, y una tétrica banda sonora compuesta por gritos de terror y sirenas de ambulancia. ¿Quién ha podido provocar semejante apocalipsis? Aunque parezca mentira, el propio Massi es el principal sospechoso. Varios testigos aseguran haberlo visto. Sí, sí, era él, claramente: con su inconfundible armadura negra y amarilla. Massi no recuerda casi nada de la noche anterior: un atracón de jalapeños lo dejó completamente grogui. Solo recuerda haber hecho un...

Disponible en edición bilingüe inglés-español, esta exitosa serie ofrece importantes e interesantes temas científicos para hacer pensar a los más pequeños. Con la exactitud de un experto y la sencillez para que lo entienda un niño, Quarks explica los principios físicos y químicos básicos de las partículas (quarks, protones, neutrones, átomos y moléculas) y los relaciona con el mundo del bebé. Contiene atractivas ilustraciones que se complementan con un lenguaje apropiado para que el bebé se maraville. Y no solo el bebé... ¡padres y cuidadores también pueden aprender mucho!...