La fiebre del oro

Over the years, people have looked for ways to improve our imperfect sight. This has led us to the world of optics, which is the study of light and how it travels. What are some of these innovations that have changed how we see the world, and how do they work? Find the answers to these questions with this Smithsonian Informational Text! Created in collaboration with the Smithsonian Institution, this text builds students' reading skills while engaging their curiosity about STEAM topics through real-world examples. It features a hands-on STEAM challenge that guides students through every step...

Rain, sunshine, warm fronts, and cold fronts. Have you ever listened to a weather report? Knowing the weather can help us plan ahead. But reporters aren’t the only ones who can track weather. You can, too! This nonfiction Spanish book explores the subject of meteorology in depth, and introduces students to important scientific concepts and vocabulary like anemometer, barometer, air pressure, warm front, cold front, rain gauge, probability, Celsius, Fahrenheit, and more. The colorful images, diagrams, sidebars, and text features will keep students connected to the text. Aligned to state and...

Learn how to help others in your community. This exciting Spanish nonfiction book describes the many ways that volunteers make a difference, from cleaning up parks to helping in food banks. Perfect for young readers, the book includes a short fiction stor

Esta colección didáctica presentada por el personaje del profesor Elibius, mostrará para los niños de forma colorida y divertida temas como: los números, las letras, las horas, el sistema solar y las tablas, más de 15 temas. Una colección educativa, muy útil para presentar a los pequeños problemas importantes para su aprendizaje de una manera lúdica. En este volumen: el cuerpo humano - Se presenta el cuerpo humano completo, es decir, células, tejidos, órganos, sistemas, esqueleto y organismo completo. También ofrece varias curiosidades sobre el cuerpo humano.

The United States grew rapidly from the time of the Louisiana Purchase to the building of the Transcontinental Railroad. All of this expansion came at the expense of Native American populations that had either lived in the region for centuries or been forced there from ancestral homes in the East. Tribes memorably fought on their own and together in an doomed effort to retain the land and a lifestyle that had long sustained their families. This book outlines some of the major conflicts of the Westward Expansion, and of the treaties and were signed, and often broken, by representatives of the...

"Las porristas es una combinación de Riverdale y Veronica Mars. No podrás soltarla, cada personaje te hará dudar de todo lo que crees saber". RILEY SAGER, autora de Final Girls HERMOSAS. TELENTOSAS. POPULARES. MUERTAS No quedan más porristas en Sunnybrook. Las primeras dos murieron una noche lluviosa en un accidente de auto. Poco tiempo después asesinaron a otras dos y el culpable recibió el disparo de un policía, por lo que nadie conoce las razones que tuvo para matarlas. La última en morir fue la hermana de Mónica. Y este insoportable recuerdo los persigue a todos. Todo eso fue...

¿Sabías que el mismo viento que te revuelve el cabello puede usarse para generar energía? Pero, ¿cómo exactamente se aprovecha el viento? ¿Y cuál es el efecto sobre el medioambiente? Lee este libro para aprender todo sobre la energía eólica. Did you know that the same wind that messes up your hair can be used to create energy? How exactly do you harness the wind? And what is the effect on the environment? Read this book to find out all about wind energy.