Ondas sonoras y la comunicación (Sound Waves and Communication)

California became a territory in the United States when the Treaty of Guadalupe Hidalgo was signed in 1848. That treaty ended the Mexican War. Several days before its signing, gold was discovered at Sutter’s Mill in what is now Sacramento. The non-Native population of the territory was less than one thousand in 1848, but the gold rush increased that number to one hundred thousand by the end of 1849. The gold rush not only made many people wealthy, it brought ecologic devastation while speeding up California’s statehood. This book richly explores this interesting history.

El catálogo de no ficción de Rivet, que abarca desde libros de introducción a la lectura hasta títulos que profundizan en las maravillas del mundo, fascina a los lectores más jóvenes. Todas las formas que tengo de hacer ejercicio, que forma parte de la serie Puedo hacerlo solo, es una lectura de nivel 2 que alimentará la curiosidad de los lectores por los temas Creciendo y hechos de la vida.

Tackle today’s toughest races while learning fractions! Marvel as contestants around the world climb, crawl, run, and jump through the world’s toughest marathons and obstacle courses. This Spanish book combines mathematics and literacy skills, and uses practical, real-world examples of problem solving to teach math and language arts content. Students will learn fractions while engaged in reading high-interest content. The glossary, index, and table of contents will further understanding of reading and math concepts, and the full-color images, practice problems, and math graphs and charts...