Cómo podemos utilizar la polea?

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

Solar Energy Is Explained. Included In This Book Is Where It Comes From, Who Uses It, And The Positive And Negative Benefits Of Using It. Correlated To Common Core, Texas TEKS, Virginia Sols, And Georgia Performance Standards.

The Uses Of Wind Energy Is The Topic Of This Book. Explains The Positive And Negative Impact This Form Of Energy Can Have On Our World.

This inspiring biographical series ties in with elementary history, science, and social studies curricula, providing teachers with a valuable interdisciplinary resource. With these books, young readers will discover historical figures who devoted their lives to making the world a better place, and changed the course of history. Text copyright 2004 Lectorum Publications, Inc.

California is home to the largest school system in the country. Students will learn about the history of California’s schools and higher education system with this nonfiction text that builds students’ reading skills and social studies content knowledge. The intriguing primary source maps, letters, documents, and images provide authentic nonfiction reading materials and keep students interested in learning. Text features include a glossary, index, captions, sidebars, and table of contents. This book connects to California state studies standards and the NCSS/C3 Framework and features...

Sitting Bull first went to battle at the age of 14. He grew to be widely respected for his bravery and insight, and became chief of the Lakota nation in his thirties. By the time he met General Custer at the Battle of Little Big Horn, his courage was legendary. Though he soundly defeated Custer, public outrage at the defeat brought thousands of cavalrymen to the area, where it took four more years before the brave chief would surrender. He was forced onto a reservation where he was later killed when police attempted to arrest him.

Un libro escrito pensando en el profesor y en las tradicionales dificultades que el tema de la educación sexual encuentra en el medio escolar. La obra ofrece un instrumento metodológico para iniciar la programación de la educación sexual en la escuela y su adecuada integración en el currículum escolar. Apunta sugerencias concretas en la formulación de objetivos, selección de contenidos, diseño de actividades y evaluación. El programa abarca los diferentes ciclos escolares, desde la educación infantil a la secundaria. De interés para profesores, tutores, orientadores y psicólogos.

Samuel y Carmen, los protagonistas de " Un hoyo profundo al pie de un olivo " (El duende verde, no 132), sufrieron una separación cruel. Samuel está en Fez, ciudad de Marruecos, Carmen en Sevilla. Ya no son niños, pero sí jóvenes, y aún les queda mucha vida; siguen enamorados y cada uno en su soledad sueña con que algún día, en algún lugar, puedan encontrarse. En aquella época, una mujer soltera no era bien mirada y Carmen sufre la presión de la familia y de los amigos para que acepte en matrimonio a otro hombre que la solicita. Ella resiste porque no pierde la esperanza de que...