Cómo podemos utilizar la palanca?

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

Eco-Friendly Energy Is Explained. The Most Current Information Is Provided While Establishing The Understanding That It Does Not Take Much To Make The World A Better Place.

Teaching Students About What A Democracy Is And How Our Country Was Founded On The Constitution, Which Protects Our Rights And Freedoms, Is The Main Focus In This Title. Filled With Democracy Fact Boxes Which Include Information To Reinforce The Text.

This historical novel will fascinate young readers as they learn about Mayan customs and lifestyle. A glossary of Mayan terms and authentic drawings will help children understand this highly advanced culture. Text copyright 2004 Lectorum Publications, Inc.

¿Que no te lo crees? Pregúntaselo a SErgio. Él te está esperando aquí mismo. Sí, aquí. Dentro de este libro. Juntos descubriréis que se puede viajar sin salir de casa. Sin coche, sin equipaje. Sólo con la imaginación. No estaréis solos. En vuestro viaje os guiarán Clío, la musa de la Historia, y seis grandes sabios. Y juntos veréis la vida del mundo desde que es mundo. ¿Te imaginas? Imagínatelo. Abre pues este libro. Es como una ventana mágina, abierta a la memoria de los siglos. ¿Sientes ya en tu cara el viento del tiempo? ADELANTE, VEN.

"Text and photographs describe common things that are yellow, including mustard, pencils, and lemonade"--Provided by publisher.