Agujeros negros (Black Holes)

For many years, people believed there were nine planets that orbited the sun. Now we say there are eight. What happened to the ninth planet, Pluto? What are the different planets like? What exactly makes a planet a planet? These are the many intriguing questions answered with this high-interest book, crafted to be accessible for readers of all levels. Young astronomers will be especially fascinated by the stunning photographs and the "Make the Grade" fact boxes.

¿Sabías que el mismo viento que te revuelve el cabello puede usarse para generar energía? Pero, ¿cómo exactamente se aprovecha el viento? ¿Y cuál es el efecto sobre el medioambiente? Lee este libro para aprender todo sobre la energía eólica. Did you know that the same wind that messes up your hair can be used to create energy? How exactly do you harness the wind? And what is the effect on the environment? Read this book to find out all about wind energy.

Which animals and plants can survive in a dry desert environment? Readers learn about the living things that make up desert food chains, including cacti, snakes, and scorpions. Colorful photographs of desert life make readers feel like they’re exploring new parts of this habitat with each turn of the page. Fact boxes provide additional information about the creatures that make up desert food chains, and a detailed food web shows how these food chains all come together. The desert is an extreme habitat, and readers will enjoy learning about the extreme plants and animals that live there.

Descubre todo lo que necesitas saber para manipular y programar bloques de comando. Encontrarás cientos de trucos y proyectos para dar forma a tus propios mapas personalizados y crear minijuegos: cómo mejorar tus armas con encantamientos, personalizar a los aldeanos, modifi car los atributos de distintas criaturas con valores de datos, crear un espectáculo pirotécnico o combinar bloques de comando para hacer programas. Un libro repleto de consejos de expertos, trucos prácticos y más de un centenar de pantallazos.

Book Features: • Ages 5-8, Grades K-2 • 24 pages, 8 inches x 8 inches • Simple, easy-to-read pages in Spanish with full-color pictures • Includes a glossary, index, and an engineering design activity • Supports NGSS Playful Learning: In Mi Biblioteca de Ingeniería: Diseño y Construcción para Jugar, kindergarten—second graders learn about the forces, energy, and designs that make up roller coasters, sports equipment, zip lines, and other things we love! Engineering Made Fun: Forces, energy, and motion are all a part of how we play. Young readers learn how engineers use science...