Los biocombustibles

A simple biography of the naturalist who founded the Sierra Club and was influential in establishing the national park system.

El Mayflower es un barco que ha llegado a ser célebre en la historia de los Estados Unidos porque en 1620 transportó desde Inglaterra al grupo conocido como "los peregrinos", quienes serían los primeros colonos europeos en establecerse en Norteamérica. Ellos zarparon desde el puerto inglés de Southampton y bautizaron como Nueva Inglaterra a la tierra que los acogió. Como señala este libro, el Pacto del Mayflower designa el acuerdo que los hombres adultos de esta comunidad firmaron a bordo del barco para fijar criterios generales que sirvieran como fundamento para el gobierno de la...

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

María José grieves at the loss of her mother who died in childbirth. She has difficulty sharing her feelings with her father and the distance between them grows with the appearance of a new woman. Her father gets another job which forces them to move to another neighborhood. The new house is small, but is near an ice cream store owned by Mr. Beto. In the store, María José makes friends with girls and boys her own age, but also meets Mr. Beto and his friends. María José and her friends try to help Mr. Beto when he comes down with a sudden illness.

High Beginning. Mexico, 1821. A masked man and acclaimed popular hero, known as Zorro, fights in the battle against colonial oppression in Alta California. From the reader series Aprende Español Con..., which features stories based on modern films and television series, carefully adapted for Spanish language students. Includes an Audio CD of the text, supplementary materials for teachers, and before and after activities for students.

One of North America's most popular sports, skateboarding combines balance, dexterity, and quick reflexes. Kids will get the lowdown on streetstyle and vertical skating and learn about the board, safety, motion and balance, and how to perform kickturns, spins, rock n' roll, and more.

A step-by-step visual guide to building your own computer games using Scratch 3.0 Scratch 3.0 has landed, so stay ahead of the curve with this fully updated guide for beginner coders. Kids will love the step-by-step, visual approach that makes even the most difficult coding concepts fun and easy to understand. Coding Games in Scratch, 2nd Edition, blends coding theory with the practical task of creating exciting games. Children learn the fundamentals of computer programming by seeing how to build their own games. Coding theory is taught through practical tasks, so young programmers don't just ...