Cómo cambia el agua (How Water Changes)

This book describes dump trucks called off-highway trucks, explaining their operating equipment and dumping beds, fuel, and jobs.

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...

The use of calendars dates back thousands of years. Why are we driven to record time, and what would happen if we did not? Who created the concept of calendars? Why do different cultures use different calendar systems? And why are calendars so important to us? It is about "time" we found out! Created in collaboration with the Smithsonian Institution, this Spanish-translated Smithsonian Informational Text builds reading skills while engaging students' curiosity about STEAM topics through real-world examples. Packed with factoids and informative sidebars, it features a hands-on STEAM challenge...

Los niños aprenderán sus primeras palabras relacionadas con la naturaleza, la vida cotidiana y la comida. ¿Qué animales podemos encontrar en una granja? ¿Cómo se llaman las frutas que comemos cada día? Estas preguntas se podrán trabajar en familia gracias a este libro, que destaca por sus colores vistosos y sus fotografías a todo color.

Young Readers Will Identify That Goods Are Objects And Services Are Activities That Can Satisfy People's Wants.