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Defines pulleys, explains their functions, and suggests simple experiments to demonstrate how they work.
Total de páginas 32
PDF, EPUB, MOBI
4.7
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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.
El original de este documento se exhibe al público en los archivos nacionales estadounidenses. La proclama fue ratificada por el congreso continental, el día 4 de Julio de 1776, en Filadelfia, Pensilvania. En ella se asume la renuncia total al dominio británico de las trece colonias inglesas en Norteamérica. Fue escrita, en lo esencial, por Tomás Jefferson. Consta de tres partes principales que integran una cadena de argumentaciones. En la primera sección se introducen ideas generales sobre la independencia. Más adelante se argumenta la tesis sobre la Libertad; los derechos que aquí...
Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.
Arrullo de nanas, canciones de corro, la señora Luna, el vestido blanco, un banco en el parque, la caligrafía, la tabla y los números o la monotonía de lluvia tras los cristales de una tarde de escuela... son algunos de los temas que recrean la más viva tradición popular en poemas de ayer y de hoy, recogidos en esta antología de poesía infantil a cargo de Jaime García Padrino y Lucía Solana.
In AD 79, the residents of the booming Roman city of Pompeii were shocked when a nearby mountain exploded, releasing superhot ash, rock, and gas on the surrounding areas. What happens next is the extraordinary account of a volcano in action. Though the people who didn't flee Pompeii were doomed, the volcano preserved their remains, allowing us to better understand a fascinating time in the Roman Empire. Astonishing photographs of Pompeii, primary source records of the occurrence, and riveting text are just some highlights of this high-interest volume.
Ya sea polvorosa o mojada, suave o flexible, en todas partes hay materia. ÁHasta el aire est‡ formado de materia! Mira c—mo los s—lidos, los l’quidos y los gases cambian de forma en este libro sobre la materia.
If a person were ever face-to-face with a huge, hungry animal with sharp teeth, they probably wouldn’t care exactly what that animal was! But from a safe location, can we tell whether it was a crocodile or alligator that wanted to take a bite? By examining their jaw structure, teeth, and other physical features, we can easily tell these two animals apart! Graphic organizers and amazing images highlight each animal’s habitat and other small differences between the two fearsome creatures, showing readers just what creature is lurking below the waters.
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