La antigua Roma (Ancient Rome)

Wind Power: A waving flag, blowing leaves, a kite soaring through the skyall are moved by wind power. Wind is also our fast-growing source of energy. Find out how wind forms and the different ways we may use it in the future.

La adquisición de la capacidad de juego y las habilidades técnico-tácticas dependen de un entrenamiento sistemático y de la participación regular en campeonatos. El período de 12 a 13 años se identifica con la edad óptima de aprendizaje. Esto requiere que el entrenador establezca o estructure el trabajo pedagógico-metódico teniendo en cuenta las características de este grupo de edad, así como el estado actual de los conocimientos de la metodología del entrenamiento. En este libro, el entrenador encontrará los conocimientos teóricos necesarios repartidos en 100 unidades con las...

Imagine traveling at half the speed of a jet plane without ever leaving the ground! Students will discover the technology that makes such speeds possible, from special tracks and safety precautions to aerodynamically designed trains. What are the limits to the speed of trains? What imposes those limits? Students also will read about the future of passenger train travel, from flying trains to trains that use huge magnets to levitate inches or centimeters off the track. Some trains safely reach speeds of more than 200 mph!

While any number of books focus on farm, jungle, or ocean animals, Busca los animales de tu ciudad concentrates on the animals that children see most often—squirrels, ducks, dogs, cats, butterflies, and more. Photo-real illustrations and concise blocks of text provide information on where these animals come from, how they reproduce, and what they eat, providing kids with a greater understanding of the animals that form such an integral part of their cities. Aunque hay muchos libros que se enfocan en los animales de la granja, la jungla o el océano, Busca los animales de tu ciudad se...

Explore outer space and learn about stars, galaxies, planets, asteroids and how these bodies are all related to one another. Featured in this book are photographs from outer space and related vocabulary.