Su silencio

In an online world where the amount of information seems to increase exponentially even week to week, student researchers can find it an ever-greater challenge to distinguish credible, vetted content from hearsay and misinformation. This book on citing internet sources will help them determine which online sources are trustworthy and which are not. Its lively and engaging instructional tips will help readers successfully negotiate the vast landscape of information out there. They will produce quality research for papers now and beyond in their academic careers with skill and confidence.

What has a head, two tails, and shoots across the sky? A comet. Coming from the far edges of the solar system, most comets travel around the Sun, while meteors appear as flashing streaks of light in the night sky. Explore these amazing celestial wonders as they zip through space! This book looks at the difference between comets and meteors and their effects on Earth. The physical characteristics of each are identified in detail. This book won’t come crashing down! It’s filled with fun facts that give additional information on this exciting science topic. This book allows students to use...

Six titles in the illuminating Who Was . . . ? series are now available in Spanish-language editions. Each title features black-and-white illustrations.

Todos los años, grandes y pequeños animales se ven obligados a migrar para sobrevivir. Tanto en el mar como en la tierra, estos animales enfrentan obstáculos y fuerzas naturales para poder reproducirse, alimentarse y mantener a su especie fuerte para futuras generaciones. Este libro es una introducción a las travesías peligrosas de la zebra, de la morsa y del cangrejo rojo de la Isla de Navidad, quienes luchan contra chitas hambrientas, locas hormigas amarillas y hasta contra su propia especie para poder completar la travesía de su vida. National Geographic apoya a los educadores K-12...