Cómo podemos utilizar la palanca?

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

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

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.

Una obra poética basada en la metáfora de un pajarito que estuvo cautivo, que después de algunos años logra salir, y decide cantar una dulcísona tonada, al compás de tres notas en una; quizá alguien lo escuche, y tal vez disfrute de su canto...Mientras tanto, el pajarito solo espera... Descansa en un curioso columpio... Reposa a través del tiempo... Está es la historia de ese pajarito cautivo, que misteriosamente logró estar libre.¿Cuál es su nombre? ¿Cómo salió? ¿Alguien lo liberó? ¿Quien podría ser?Y lo más importante... Que sea quien sea, debió de tener la llave. Más...

Land has many different characteristics. It can be hilly, rocky, grassy, narrow, and dry. Or, it can be flat, smooth, sandy, wide, and wet! This Spanish book introduces students to the concept of landforms. With images that are easy to identify and clear, simple sentence structures, this science reader simplifies scientific concepts for young students as they improve their reading skills. A fun and easy science experiment and Your Turn! activity provide more in-depth opportunities for additional learning. Nonfiction text features include a glossary and an index. Engage students in learning...

Uncovers the secret codes that different animal species use to relate to each other, revealing that communication among certain animals is not different from human communication.

Explores The First Settlements That Were Formed In America, Discussing The Explorers That Made Them Possible And The Reasons For The Colonization.