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

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.

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.

One of the skills employers want most in new hires is the ability to speak well. Public speaking can not only advance a person in almost any career but can also help an individual do better in school as well. Following the English Language Arts standards for Speaking and Listening, this book teaches readers why public speaking can be such an effective tool, how to craft a powerful speech, and how to overcome one of the most common problems people have with talking in front of a crowd�stage fright.

¿Qué hizo que una familia latinoamericana abandonara su tierra natal para partir con sus tres hijos, de diez, trece y quince años, a tierras del continente africano? Siga las peripecias y aventuras de la familia Jacobi Mangold durante quince años de servicio misionero en el Hospital de Leprosos de Masanga, Sierra Leona; el Hospital Scheer Memorial en Nepal, al norte de la India; y el Hospital Misionero de Yuka, Zambia. Comparta su período de adaptación a una vida sin electricidad, televisión ni otras comodidades básicas, y su angustia al sufrir un ataque al hospital por fuerzas...

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

Para celebrar el 20o aniversario de la publicación de Harry Potter y la piedra filosofal, este libro, que cubre miles de años de historia de la magia, invita a los lectores a emprender un viaje hechizante por el plan de estudios de Hogwarts.Desde Cuidado de Criaturas Mágicas hasta Herbología, pasando por Defensa Contra las Artes Oscuras, Astronomía, Adivinación y muchas asignaturas más. Prepárate para maravillarte con piezas formidables procedentes de los archivos de la Biblioteca Británica, así como bocetos y páginas manuscritas de J.K. Rowling e increíbles...