El sistema óseo (The Skeletal System)

The need for speed is the motivating factor in this engaging, Spanish book. Readers learn the history of travel from the very slow to the supersonic and beyond, including everything in between. They learn and discover the factors that influence motion for all types of vehicles: land, air, and water alike. They also learn different ways to measure speed and read about energy uses for different vehicles. With greater speed comes greater risk. Readers learn how engineers are always seeking new and better ways to keep people safe as they travel faster and go farther. This 6-Pack includes six...

Una bonita historia contada con un leguaje muy accesible por dos zorros, padre e hijo, con la que los más pequeños descubrirán las maravillas y los misterios del universo. ¿Conoces los planetas y satélites del sistema solar? ¿Sabes cuántos millones de galaxias hay en el universo? ¿Tienes idea de a qué velocidad gira el Sol? Papá Zorro responde a las preguntas de su hijo y le explica todos los secretos sobre el universo, mientras los dos contemplan las estrellas desde la Tierra. Esta segunda parte ocurre en el sistema solar, y habla sobre la fusión, la gravedad, el vacío y lo que...

Where did the sunflower come from? How does it grow so tall? How can its thin stalk support such a large and heavy head? These and many other questions are answered in this dazzling book. Using lushly detailed illustrations and photographs, the book takes us inside the sunflower to examine its stem, root system, leaves, and flowering heads, proving an understanding of this unique plant's structure, growth, flowering, reproduction, and cultivation.

Learn the history of number systems with this engaging Spanish book! This text combines mathematics and literacy skills, and uses practical, real-world examples of problem solving to teach math and language arts content. Students will learn place value while reading about the number systems of the Egyptians and Romans, and also learn important vocabulary terms like cuneiform, binary systems, roman numerals, and more! The full-color images, math charts, and practice problems make learning math easy and fun. The table of contents, glossary, and index will further understanding of math and...