¿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.

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.

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.

Rhyming text is ideal for building phonemic awareness and phonics skills. This series uses delightful rhyming text and engaging photographs to introduce beginning readers to four common weather conditions. These books build the foundation for reading success and make learning about weather fun!

Este Cuaderno de ejercicios que acompaña a nuestro nuevo curso general de español, que sigue las especificaciones del Marco Europeo de Referencia y del currículum del Instituto Cervantes, ideal para cursos de nivel inicial absoluto (A1).

A simple biography of the naturalist who founded the Sierra Club and was influential in establishing the national park system.

Los juguetes, los oficios y los medios de transporte son los protagonistas de Caballo ACCIÓN, una nueva serie dentro de la colección de Caballo Alado que combina magníficas ilustraciones con fotografías, y textos sencillos que combinan la letra de palo y la manuscrita. Cada título incluye un breve apartado documental que complementa el texto básico.