La historia de los sistemas numéricos: Valor posicional (The History of Number Systems: Place Value)

27 recorridos, muchos de ellos clásicos y otros menos frecuentados, pero todos ellos imprescindibles para conocer uno de los espacios protegidos más singulares del planeta. Rutas en las que el autor sabe, además, cómo inculcar en el lector todo el interés que el itinerario merece, relatando detalladamente cada recorrido y los principales valores ecológicos que han motivado su inclusión en la guía.

¿Dónde puedes encontrar el color amarillo? ¿Tiene algún significado especial este color? Los jóvenes lectores aprenderán a identificar objetos amarillos y los lugares donde aparecen en Amarillo, uno de los libros de Los niños y la ciencia: Colores. Where can you find the color yellow? Does this color have any special meanings? Young readers will learn to identify yellow objects and the places they appear in Yellow, a Science Kids: Colors book.

Many people around the world live in the forest biome. That’s because temperate forests grow in places where winter isn’t too cold and summer isn’t too hot. Readers learn that we need to care for this biome that’s in so many backyards. Simple, accessible language describes common trees and characteristics of both evergreen and deciduous forests, and full-color photographs highlight their beauty. Animals and their adaptations to this biome are addressed in the main content as well.

Twirling tornadoes, horrific hurricanes, deadly dust storms, and blowing blizzards. Depending where you live, you may have experienced one of these extreme storms. Although being caught in extreme weather can be dangerous, being prepared can save your life. This nonfiction Spanish book introduces students to extreme weather, and teaches them important scientific concepts and vocabulary. The colorful images, diagrams, sidebars, and text features will keep students connected to the text. Aligned to state and national standards, the fun lab activity provides a real-world learning experience that ...