Algoritmos: la base de la programación de computadoras (Algorithms: The Building Blocks of Computer Programming)

Describes where fossil fuels come from, their uses and forms, the harm they cause to the environment, and sources of renewable energy.

As a land that’s constantly in flux, Earth sometimes reveals clues about the plants, animals, and other organisms that lived long ago. Fossils teach us much about what life was like millions of years ago, answering the questions of how Earth changed and maybe even why it changed. This essential Earth science topic is thoroughly explained through manageable text, fact boxes, informational charts and diagrams, and a glossary and index. Readers will become young Earth detectives by the time they’re through with this text!

Los Tutús son una introducción encantadora al ballet para niños. Acompañe a Polly Plie', Jana Jete' y Ana Arabesque como le enseñan todos los pasos de baile chulos que saben. Afíliese al entusiasmo como autor y bailarín, Nancy Hahn le da un Pas de Deux de la diversión interactiva. También incluido es la versión musicalmente realzada

A little child asks the "big question" (grande question) that is never formulated: why are we on earth? and get answers from different people.

Por qué hay día y noche? Porque la Tierra gira sobre sí misma en 24 horas y porque el Sol no puede iluminar más que un lado a la vez.El cielo, las estrellas y la noche ilustrado por Christian Broutin, Henri Galeron y Pierre-Marie Valat, es un libro de la colección Altea Benjamín, la enciclopedia para responder a las preguntas de los niños que ya leen solos. ENGLISH DESCRIPTION Why is there day and night? Why does the Earth rotate on its axis and comes full circle in 24 hours? Why does the Sun only illuminate one side of the Earth at a time? Fascinating information about space and...