Proyectos reales para explorar la Primera Guerra Mundial y los años 20 (Real-World Projects to Explore World War I and the Roaring ’20s)

When we look up at the night sky you can see millions of stars, but what do you think we could see in space if we left Earth? If we could hop into a special ship and blast off, traveling billions of miles away from Earth, we’d see the Milky Way galaxy. In this book, readers take an incredible journey through that galaxy, exploring the universe and learning how it was formed and what will one day happen to these enormous groups of stars. From mysterious dark matter to the black holes at the center of galaxies, readers will also dive into the mysteries of the universe scientists have spent...

The scientific method lists important steps in the process of conducting scientific study and research. With detailed images and fascinating sidebars, this nonfiction book explores the scientific method and scientific practices in depth, and introduces students to new concepts, vocabulary terms, and STEM topics. Aligned to state and national standards, the leveled text supports students reading at above-, below-, and on-grade level. The fun lab activity encourages students to think like scientists. Keep students engaged in learning with this Spanish book.

Toda la información sobre las técnicas tradicionales -y las más actuales- para evitar el embarazo, siempre en forma sistematizada y comprensible. El problema de los embarazos no deseados en las adolescentes es tan común como el lamentable desconocimiento de las formas en que pueden evitarlo; actualmente sólo un tercio de la población aplica de manera constante y consciente los métodos anticonceptivos, y es triste saber que el aborto resulta una práctica común. En estas páginas descubrirás: - Las ventajas y los inconvenientes de la píldora anticonceptiva. - Qué es el anillo...

Explores in story format, what drove Columbus to sail west in search of a new passage to India. Includes study questions.

Do you know why there are thirteen stripes and fifty stars on the American flag? Or how the American flag inspired Francis Scott Key to write "The Star Spangled Banner?" Find out the answers to these questions and more in The American Flag.